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  "id": "dublin-traffic-control-scats",
  "title": "SCATS Adaptive Signals and the Traffic Management Centre",
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   "effectiveAt": "2026-09-25",
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   "summary": "Created the first structured Evidence Passport with 16 claims and 8 source dossiers.",
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     "summary": "Added claim-level evidence mapping and source dossiers."
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     "operation": "add",
     "path": "/revisionHistory",
     "summary": "Established a permanent, hash-addressed baseline revision."
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     "evidenceGrade": "official",
     "timeline": {
      "started": 1989,
      "ended": null
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    "governance": {
     "operator": "Dublin City Council (Traffic Management and Control, Environment & Transportation Department)",
     "actorTypes": [
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    "claims": [
     {
      "id": "clm-873a4009360753d2",
      "field": "snippet",
      "text": "first put its traffic signals under SCATS, the Sydney Coordinated Adaptive Traffic System, in 1989 on 35 initial junctions",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      ],
      "supportNote": "The council's Senior Executive Officer for traffic management is quoted: 'We first introduced the SCATS system in Dublin in 1989 on 35 initial junctions.'",
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     {
      "id": "clm-cf60e1b5723b1054",
      "field": "snippet",
      "text": "by 2017 some 850 of around 1,000 signals in the city were connected",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      "supportNote": "Verbatim: 'Of around 1,000 traffic signals in the city, 850 are connected up.' The rest are described as standalone pedestrian crossings.",
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      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     },
     {
      "id": "clm-e7dc3061247ab031",
      "field": "snippet",
      "text": "with loops cut into the road counting the gaps between vehicles so the system can lengthen or shorten each green as traffic changes",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-e3b260bc73f834a3",
       "src-d74734d20e0b44ed"
      ],
      "supportNote": "The report explains the figure-eight 'traffic loops' at junctions and that by counting the spaces between vehicles the system switches signals accordingly; the dataset page describes SCATS detecting vehicle presence in each lane with inductive loops.",
      "caveat": null,
      "interpretation": {
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     {
      "id": "clm-2f5e17bc97dc633d",
      "field": "snippet",
      "text": "The council's traffic management centre in its Civic Offices at Wood Quay watches the network around the clock on roughly 400 cameras",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      ],
      "supportNote": "Dublin.ie (March 2017): staff monitor screens in Wood Quay '24 hours a day, 365 days a year' with '400-odd cameras'. The Dublin Inquirer counted 380 cameras in September 2017 and in 2023 places the centre in the Civic Offices on Wood Quay, staffed around the clock.",
      "caveat": "Camera counts are from 2017; a 2016 council programme page gave about 300, and no newer official count was found.",
      "interpretation": {
       "added": false,
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     {
      "id": "clm-44c47871eec1aba1",
      "field": "snippet",
      "text": "its operators can change signal sequencing in real time, including at junctions in neighbouring council areas",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      ],
      "supportNote": "The 2023 report: staff 'can change the sequencing of traffic lights in real time', and, per Dublin Commuter Coalition, also in parts of Fingal, South Dublin and Dún Laoghaire-Rathdown. Smart Dublin (2016) describes the centre as handling traffic management for the Greater Dublin Area, with manual override during incidents.",
      "caveat": null,
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       "added": false,
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     {
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      "field": "snippet",
      "text": "A Dublin Public Transport Interface Module (DPTIM), piloted in 2013, feeds the live positions of Dublin Bus vehicles into SCATS through virtual detectors",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      "supportNote": "The council's pilot paper describes the Dublin Bus AVL feed being processed through virtual detectors in DPTIM and passed to SCATS; the supplier's case study describes the delivered system for the council and Dublin Bus.",
      "caveat": "The pilot is dated by the conference its paper was presented at; its current extent across corridors is stated only by the supplier.",
      "interpretation": {
       "added": false,
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     {
      "id": "clm-284d852168c35866",
      "field": "snippet",
      "text": "so a bus stuck in congestion can trigger a change of signal plan",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      "supportNote": "The supplier lists the interventions — a bus priority timing plan, an immediate green on detection of a bus, and a side-road bias — triggered when thresholds such as queuing time or bus numbers in a virtual detector are breached; the pilot paper notes the feed carries whether a bus is in congestion.",
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     {
      "id": "clm-61c40efd41e87271",
      "field": "snippet",
      "text": "The council publishes the SCATS detector counts as open data under Creative Commons Attribution 4.0",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      ],
      "supportNote": "The dataset page: published by Dublin City Council, licensed under Creative Commons Attribution 4.0, containing traffic counts from SCATS detectors at junctions.",
      "caveat": "The dataset warns that one vehicle can be counted at several junctions along a route; the counts show trends, not trips.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     },
     {
      "id": "clm-b74484660737fa36",
      "field": "impact",
      "text": "its 2013 DPTIM pilot on the Malahide Road corridor reported an overall 6% improvement in southbound bus journey times over the whole corridor",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      "supportNote": "Scenario 5, covering the entire modelled corridor: 'an overall 6% improvement to bus journey times was observed in the southbound direction.'",
      "caveat": "The council's own pilot, measured by the team that built it, on one corridor; no northbound figure is given for the whole corridor.",
      "interpretation": {
       "added": false,
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     {
      "id": "clm-24e23bad76460f3b",
      "field": "impact",
      "text": "4% southbound and 4.5% northbound across the combined junction changes — with one section 3% slower southbound",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
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      "supportNote": "Scenario 4 (all changes combined, Greencastle to Poplar Row): 4% southbound and 4.5% northbound. Scenario 3 recorded 'a 3% decline in the journey times for buses travelling southbound' alongside a 24% northbound improvement.",
      "caveat": null,
      "interpretation": {
       "added": false,
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     },
     {
      "id": "clm-2128420290ffddba",
      "field": "impact",
      "text": "No independent evaluation of SCATS or of bus priority in Dublin was found",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-33c1f13a0c7d3436",
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      "supportNote": "A finding of absence: none of the sources, including the council's own pilot paper and two reports from the traffic control room, cites an independent or published official evaluation of SCATS or bus priority in Dublin, and searches found none. Global SCATS averages published for Sydney are not transferable to Dublin and are not used here.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     },
     {
      "id": "clm-c9219286ac88e561",
      "field": "impact",
      "text": "the traffic team told a reporter in 2017 that time saved is the main way it measures progress",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-e3b260bc73f834a3"
      ],
      "supportNote": "Karen Hosie: 'What we're trying to do is save time … That's the main way we measure progress.'",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-cd4ea7df1a285859",
      "field": "impact",
      "text": "The open counts reach back to a January–April 2012 file, but as of September 2026 the newest month in the national catalogue is August 2025",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      "supportNote": "The catalogue lists 'Volume Data Jan - April 2012 for Dublin City' as the oldest SCATS dataset and 'Jul-Dec 2025' as the newest, whose only resources are 'SCATS Volumes Aug 2025' and 'SCATS Volumes Jul 2025'; no 2026 dataset exists as of the query on 25 September 2026.",
      "caveat": "Counted from the live catalogue on 25 September 2026; the council may publish further months later.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     {
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      "field": "lesson",
      "text": "In February 2023 the council's traffic management centre had five operators, down from 12 a year earlier, and the council did not answer questions about it",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      "supportNote": "The report: operators 'plunged from 12 this time last year to five now, according to an official in the council's transport department'; 'the council didn't respond to queries asking about this.'",
      "caveat": null,
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       "added": false,
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     },
     {
      "id": "clm-014645ccc03809c5",
      "field": "lesson",
      "text": "more pedestrian time at the Five Lamps can delay the Luas",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      "supportNote": "Councillor Janet Horner: 'If you increase pedestrian time at the Five Lamps, it can cause a back-up that can delay the Luas.'",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     },
     {
      "id": "clm-7dcd5913b6976b3e",
      "field": "lesson",
      "text": "the choice of whom the lights favour, which councillors argue about openly",
      "statementKind": "descriptive",
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      "mappingStatus": "mapped",
      "sourceRefs": [
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      "supportNote": "In 2023 councillors publicly weighed traffic flow against pedestrians, cycling and public transport ('Focusing on traffic flow means that other road users have to wait'); in 2017 the transport committee chair favoured more hard engineering over reliance on signals. The absence of a public yardstick rests on the impact finding above.",
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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      "id": "src-e3b260bc73f834a3",
      "title": "Dublin Inquirer, inside the council's traffic control room (September 2017) (media)",
      "url": "https://dublininquirer.com/2017/09/27/who-or-what-decides-the-rhythm-of-dublin-s-traffic-lights/",
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       "type": "descriptive-source-note",
       "value": "Dublin Inquirer report from the council's traffic room on the seventh floor of the Civic Offices at Wood Quay. Senior Executive Officer Karen Hosie: 'We first introduced the SCATS system in Dublin in 1989 on 35 initial junctions … Then over the years we rolled it out', and 'Of around 1,000 traffic signals in the city, 850 are connected up', the rest being standalone pedestrian crossings. Describes the in-road loops that count gaps between vehicles, data collected every two minutes, some 380 cameras, 24/7 staffing, and Hosie's 'What we're trying to do is save time … That's the main way we measure progress.' Also reports the Bachelor's Walk bus gate as having reduced bus delays, without a figure.",
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      "title": "Dublin Inquirer, on the traffic management centre's staffing (February 2023) (media)",
      "url": "https://www.dublininquirer.com/the-team-overseeing-the-city-s-traffic-lights-is-at-less-than-half-strength/",
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       "value": "Operators in the traffic management centre fell from 12 a year earlier to five, according to a council transport official; the council did not respond to queries. The centre, in the Civic Offices at Wood Quay, is staffed around the clock and manages flows with SCATS; staff can change sequencing in real time, and according to Dublin Commuter Coalition also in parts of Fingal, South Dublin and Dún Laoghaire-Rathdown. Councillor Janet Horner: more pedestrian time at the Five Lamps 'can cause a back-up that can delay the Luas'.",
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      "title": "Dublin.ie, 'Run This Town: Dublin's Traffic Control' (official)",
      "url": "https://dublin.ie/work/stories/run-this-town-traffic-control/",
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       "name": null,
       "domain": "dublin.ie",
       "classification": "not-classified"
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       "publishedAt": "2017-03-21",
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       "type": "descriptive-source-note",
       "value": "Profile of the traffic control room supervisor on the portal of Dublin's local authorities: staff monitor screens in Wood Quay '24 hours a day, 365 days a year' and have '400-odd cameras in locations all over the city'. The page shows no visible date; the date is the portal's own published-date metadata.",
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     {
      "id": "src-1c26515880b05f38",
      "title": "Smart Dublin, Traffic Management Centre (official)",
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      "publisher": {
       "name": null,
       "domain": "smartdublin.ie",
       "classification": "not-classified"
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      "role": "claim-evidence",
      "claimRefs": [
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      "temporal": {
       "publishedAt": "2016-02-29",
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       "recordLastVerifiedAt": "2026-09-25",
       "dossierCreatedAt": "2026-09-25",
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       "status": "publication-and-record-dates-recorded"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "Smart Dublin post of 29 February 2016: the Dublin Traffic Management and Incident Centre handles traffic management for the Greater Dublin Area with about 300 CCTV cameras across the city, the M50 and neighbouring local authorities; sensors at intersections detect vehicles and pedestrians and lights are adjusted dynamically, with manual override during incidents.",
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     },
     {
      "id": "src-33c1f13a0c7d3436",
      "title": "Kinane & O'Donnell (Dublin City Council), DPTIM pilot study (official)",
      "url": "https://itrn.ie/wp-content/uploads/2020/07/Pilot-Study-Dublin-Public-Transport-Interface-Module-ITRN2013.pdf",
      "publisher": {
       "name": null,
       "domain": "itrn.ie",
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      "locator": {
       "type": "descriptive-source-note",
       "value": "Conference paper by two Dublin City Council ITS officers on the Dublin Public Transport Interface Module pilot: the Dublin Bus AVL feed (SIRI, 30-second polling) is processed through virtual detectors and fed to SCATS to influence signal decisions, tested on the Malahide Road corridor from Amiens Street. Results by scenario: 7% southbound and 4% northbound; 3% and 5.5%; a 3% decline southbound and 24% improvement northbound; 4% southbound and 4.5% northbound combined; and 'an overall 6% improvement to bus journey times' southbound over the whole corridor. Describes public transport priority as 'a new development for Dublin City Council' in 'early testing phase'. The host files it as an ITRN 2013 paper; the PDF itself carries no publication date.",
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     {
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      "title": "Nicander, Dublin traffic signal priority case study (vendor)",
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       "value": "The supplier's case study: Nicander delivered DPTIM for Dublin City Council and Dublin Bus, integrating the Dublin Bus AVL feed with SCATS to give buses signal priority on Quality Bus Corridors through priority timing plans, immediate greens and side-road bias. States that DPTIM 'has achieved its main purpose' — a supplier's claim, not an evaluation.",
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       "value": "Dublin City Council dataset on the national open data portal: hourly traffic counts from SCATS detectors at junctions, published under Creative Commons Attribution 4.0. Warns that a vehicle can be counted several times along a route and that the counts are best used for trends at a single junction. Continuously maintained catalogue page.",
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       "value": "Catalogue query run on 25 September 2026: Dublin City Council's SCATS volume datasets run from a 'Volume Data Jan - April 2012' file to 'Jul-Dec 2025', whose only resources are July and August 2025; no 2026 dataset exists. A live query, so it carries no date of its own.",
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     "claimsMapped": 16,
     "sourcesTotal": 8,
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     "sourcesWithArchive": 0,
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     "Publisher names and source languages have not yet been classified; domains are recorded without guessing.",
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     "The project-level evidence grade ranks the strongest source in the entry; it is not a truth score for every claim."
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 ]
}