JASC 5313

Service difficulty reports · 36,303

Reports filed under 5313 · Fuselage Main, Longeron/Stringer, newest first.

Query with SQL
duckdb -csv -c "SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
  FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
  WHERE jasc_code = '5313'
  ORDER BY difficulty_date DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SDR CALA2021062000911Stringer · dentedSUPPORT TASK: WHILE ACCOMPLISHING SKIN REPAIR FOUND STRINGER 16L TO BE DENTED. REF HAECO GSO NRC 9285404 REINSPECTION DIP RAISED ON LOG PAGE 6464529Jun 19, 2021 · N14102 · Boeing 757224SDR FDEA202106181568Longeron · corrodedCENTER CARGO - BILGE STATION 5-11 LONGERON 52 FOUND WITH SURFACE CORROSION. CENTER CARGO BILGE STATION 5-11 LONGERON 52 SURFACE CORROSION REMOVED AS PER SRM 51-21-01-OG AND FOUND EXCEEDED LIMIT. LONGERON 52 CARRIED OUT REPAIR AS PER EA 1-5310-T0362561 PARTJun 18, 2021 · N578FE · Doug MD11FSDR CALA2021061800897Stringer Splice · corrodedAFT CGO COMPT BILGE AREA FR60-FR59 STGR42L SPLICE FND CORROSION REF HAECO NON-ROUTINE LP:9440976 - ORIGINATED BY EMP V906550, SPEC NO.A3NB-53-4-6179. AFT CGO COMPT BILGE AREA FR59-60 STR42L STRINGER SPLICE REPLACED AS PER ECRA 5341-01248 REV A.Jun 18, 2021 · N4873U · Airbus A319132SDR CALA2021061800894Stringer Splice · corrodedAFT CGO COMPT BILGE AREA FR60-FR59STG41L SPLICE FND CORROSION REF HAECO NON-ROUTINE LP:9440977 SPEC NO.A3NB-53-4-6179. AFT CGO COMPT BILGE AREA FR59-60 STR41L STRINGER SPLICE REPLACED AS PER ECRA 5341-01248 REV A.Jun 18, 2021 · N4873U · Airbus A319132SDR CALA2021061800893Stringer · corrodedAFT CGO COMPT BILGE AREA FR60-FR61 STGR44 STRINGER FND CORROSION REF HAECO NON-ROUTINE NO.9439511, SPEC NO.A3NB-53-4-6179. ,AFT CGO COMPT BILGE FR60-61 STGR44 CORRODED STRINGER REPAIRED AS PER SRM 53-00-13-300-001 REV 135,THIS REPAIR APPROVED AS CAT B REPAIR RJun 18, 2021 · N4873U · Airbus A319132SDR SWIA202161465None · none* WHILE INSPECTING PASSENGER DOOR SURROUND STRUCTURE BELOW FLOOR DISCOVERED BENT FLOOR STRUCTURE INTERCOSTAL AT APPROX LBL 27 AND F/S 333 - 349 (C-CHECK RO 9/27/2021) REMOVED AND REPLACED BENT FLOOR STRUCTURE INTERCOSTAL AT APPROX LBL 27 AND F/S 333 - 34Jun 17, 2021 · N708EV · Cndair CL6002C10SDR SWIA202161464None · bent* WHILE INSPECTING PASSENGER DOOR SURROUND STRUCTURE BELOW FLOOR DISCOVERED BENT FLOOR STRUCTURE INTERCOSTAL AT APPROX LBL 27 AND F/S 310-333 (C-CHECK RO 9/27/2021) REMOVED AND REPLACED PASSENGER DOOR SURROUND STRUCTURE BELOW FLOOR INTERCOSTAL AT APPROXJun 17, 2021 · N708EV · Cndair CL6002C10SDR SWIA2021100161364Stringer · corrodedEVIDENCE OF CORROSION IN MULTIPLE LOCATIONS ON STRING 20L BETWEEN FS 349.00 - 364.00 & 379.00 €“ 437.00 (C-CHECK RO 9/27/2021) COMPLIED WITH PERMANENT REPAIR 20L BETWEEN FS 349.00 - 364.00 & 379.00 €“ 437.00, SRM 51-42-21-001-001-A01, SRM 51-46-02-001Jun 17, 2021 · N708EV · Cndair CL6002C10SDR SWIA2021100161363Stringer · corrodedEVIDENCE OF CORROSION IN MULTIPLE LOCATIONS ON STRING 20R BETWEEN FS 364.00 €“ 394.00 (C-CHECK RO 9/27/2021) REPAIRED CORROSION ON STGR 20R BETWEEN F.S. 364.00 AND F.S. 394.00 PER MHIRJ REO 670-53-21-2082 REV -- DATED 2021-08-09, CRJ 700 SRM 51-42-06Jun 17, 2021 · N708EV · Cndair CL6002C10SDR SWIA2021081860347Stringer · corrodedSTRINGER 21L BETWEEN FS333 AND FS347 HAS EXFOLIATED CORROSION AROUND A FASTENER HOLE AND REQUIRES A REPAIR (C-CHECK RO 8/16/2021) REPAIRED AND REPLACED STR 21L BETWEEN FS 333-347 PER REO 670-53-21-2089 REV -- DATED 2021-07-19, CRJ 700 SRM 51-42-06-001-Jun 17, 2021 · N755EV · Cndair CL6002C10SDR SWIA2021081860346Stringer Splice · corrodedSTRINGER SPLICE AT FS333 STRINGER 21L HAS EXFOLIATED CORROSION AROUND A FASTENER HOLE AND REQUIRES REPLACEMENT (C-CHECK RO 8/16/2021) REPLACED STR 21L REF. CRJ 700 SRM 51-42-06-001-001-A01 AND DWG SH670-32420 REV E / C/W TASK CARD 51-900-1002-SKYJun 17, 2021 · N755EV · Cndair CL6002C10SDR DALA2021061803313Stringer · corrodedSHIP 3238 CORROSION STRINGER 43L, BTW FR 54 & FR 55 IN AFT CARGO COMPARTMENT. CORRECTIVE ACTION: PERFORMED REPAIR PER ER/A 592077-14 PRI REV.0 AND ER/A 592077-14 REV. ORIGINAL.Jun 17, 2021 · N338NW · Airbus A320212SDR CALA2021061800892Stringer Splice · corrodedAFT CGO COMPT BILGE AREA FR60-FR59STGR42L SPLICE FND CORROSION REF HAECO NON-ROUTINE LP:9440976 - ORIGINATED BY EMP V906550, SPEC NO.A3NB-53-4-6179. PERFORMED BY EMP V906550,AFT CGO COMPT BILGE AREA FR59-60 STR42L STRINGER SPLICE REPLACED AS PER ECRA 5341-0124Jun 17, 2021 · N4873U · Airbus A319132SDR SWIA202160559Stringer · corrodedCORRORROSION ON STR 27 BETWEEN FS333.00 AND FS 349.00 (C-CHECK RO 8/18/2021) REMOVED AND REPLACED WITH NEW STR 27 FROM FS 33.00 - 349.00 REF CRJ 900 SRM 51-42-06-001-001-A01 AND DRAWING SH67031350 REV A. LEAK CHECK GOOD / COMPLIED WITH SKYWEST FORM M-3Jun 16, 2021 · N804SK · Cndair CL6002D24SDR DALA2021061803326Stringer · crackedSHIP 682 WHILE GAINING ACCESS TO STA 1640 LH FRAME FOR FRAME REPAIR, MAINTENANCE FOUND STR 10L AT STA 1620 CRACKED. CORRECTIVE ACTION: REMOVED AND REPLACED STR SECTION FROM STA 1620-1640L STR 10 IAW B757 SRM. (1842596)Jun 16, 2021 · N682DA · Boeing 757232SDR FDEA202106161567Stringer · corrodedCORROSION ON STR 38R BTW FR42 TO FR46 ON AIR CONDITION BAY PERFORMED PERMANENT REPAIR ON STR 38R BTW FR45 TO FR46 ON AIR CONDITION BAY IAW EA # 6-5310-T0362286 EA TITLE: FUSELAGE MAINFRAME - CORROSION ON STRINGER S-38R BETWEEN FRAMES 45 AND 46 - BLEND REPAJun 16, 2021 · N683FE · Airbus A300F4605RSDR SWIA202161758None · corrodedSILL/INTERCOSTAL AT STR21L BETWEEN FS310 AND FS333, SHOWS EVIDENCE OF CORROSION. (C-CHECK RO 10/9/2021) REMOVED AND REPLACED CABIN SILL/INTERCOSTAL AT STR 21L BETWEEN F.S. 310 AND F.S. 333 IAW CRJ 700 AMM 51-42-06 AND SRM 51-42-21Jun 15, 2021 · N709EV · Cndair CL6002C10SDR FDEA202106151545Longeron Splice · crackedCENTER CARGO - STATION 5-113 TO STATION 1541 LONGERON 44 RIGHT LONGERON SPLICE FOUND CRACKED. CENTER CARGO STATION 5-113 TO STATION 1541 LONGERON 44 RIGHT CRACKED LONGERON SPLICE REMOVED AND REPLACED AS PER SRM 51-33-01-0G. LONGERON SPLICE FABRICATED BY Jun 15, 2021 · N612FE · Doug MD11FSDR FDEA202106151544Longeron Splice · crackedCENTER CARGO - RIGHT HAND TUNNEL STATION 5-113 TO STATION 1541 LONGERON 35 RIGHT LONGERON SPLICE FOUND CRACKED. CENTER CARGO RIGHT HAND TUNNEL STATION 5-113 TO STATION 1541 LONGERON 35 RIGHT CRACKED LONGERON SPLICE REMOVED AND REPLACED AS PER SRM 51-33-01-Jun 15, 2021 · N612FE · Doug MD11FSDR FDEA202106151578Longeron · corrodedFOUND BULGE IN SKIN AND 3EA. FAILED FASTENERS ON LONGERON 50R AT AFT FUSELAGE DRAIN PLUG. REMOVED CORRODED LONGERON SECTION AT STATION 1551-1571, LONGERON 50R. SKIN IS OK NO CORROSION FOUND. ACCOMPLISHED REPAIR PER EA 1-5310-T0362240 MAINFRAME CORJun 15, 2021 · N589FE · Doug MD11FSDR CALA2021061800885Stringer · corrodedAFT CGO COMPT BILGE AREA FR60-FR61 STGR32L STRINGER FND CORROSIO N REF HAECO NON-ROUTINE NO.9439516, SPE C NO.A3NB-53-4-6179. AFT CARGO COMPT BILGE AREA FR60-61 STGR32 L CORRODED STRINGER REPAIRED AS PER SRM 53-00-13-300-001 REV135, THIS REPAIR APPROVED AS CAJun 15, 2021 · N4873U · Airbus A319132SDR CALA2021061500883Stringer · corrodedAFT PUT BETWEN FR63-64 LEFT STR42L HAS COR ROSION. REPLACED DAMAGED SECTION OF S42L BETWEEN FR 62-64 IAW SRM 53-00-13-300-001. SUPPLEMENTAL INSPECTIONS REQUIRED IAW SRI 53-00-13-205-001 BEGINNING AT 60000FC OR 120000FH FROM REPAIR.Jun 15, 2021 · N488UA · Airbus A320232SDR SWIA2021081060217Stringer · corrodedSTGR21R IS CORRODED BETWEEN FS349.00 TO FS364.00 (C-CHECK RO 8/6/2021) REMOVED AND REPLACED NEW STGR 21R P/N SH670-31383 REF CRJ700 SRM 51-42-06-001-001-A01 AND DWG SH 670-31350 REV A. COMPLIED WITH TASK CARD 51-900-1002-SKY AND FORM M M-337 PERFORME LEJun 14, 2021 · N709SK · Cndair CL6002C10SDR MASA20210628240Stringer · corrodedCORROSION ON STGR 22R BTW FS349-333 AT E/E COMPARTMENT. (E/E). (E/E).|NEW STRINGER 22R BTW FS.349-333 AT E/E COMPARTMENT WAS INSTALLED PER CRJ-900 SRM 51-42-006-001-001-A01 AND CRJ-900 SRM 51-42-21-001-001-A01Jun 14, 2021 · N955 · Cndair CL6002D24SDR MASA20210614235Stringer · corrodedSTGR 27 FWD CORRODED AT FS284| R&R STGR 27 FWD AT FS284 IAW SRM 51-42-06 AND SRM 51-42-21Jun 14, 2021 · N922 · Cndair CL6002D24SDR MASA20210706263Stringer · corrodedCORROSION ON STGR 26R BTW FS295-310 AT E/E COMPARTMENT. STGR 26R BTW FS 280-333 AT E/E COMPARTMENT WAS REPLACED FOR A NEW ONE PER CRJ 900 SRM 51-42-06-001-001-A01Jun 13, 2021 · N955LR · Cndair CL6002D24SDR MASA20210706262Stringer · corrodedCORROSION ON STGR 26L BTW FS310-319 AT E/E COMPARTMENT. STGR 26L BTW FS280 - 333 WAS REPLACED FOR A NEW ONE PER CRJ 900 SRM 51-42-06-001-001-A01Jun 13, 2021 · N955LR · Cndair CL6002D24SDR MASA20210628245Stringer · corrodedCORROSION ON STGR 27 BTW FS333-350 AT E/E COMPARTMENT|STGR 27 BTW FS333-352 WAS REPLACED FOR A NEW ONE PER CRJ 900 SRM 51-42-06-001-001-A01Jun 13, 2021 · N955 · Cndair CL6002D24SDR MASA20210628244Stringer · corrodedCORROSION ON STGR 26L BTW FS333-349 AT E/E COMPARTMENT|STGR 26L BTW FS333-349 AT E/E COMPARTMENT WAS REPLACED FOR A NEW ONE PER CRJ 900 SRM 51-42-06-001-001-A01Jun 13, 2021 · N955 · Cndair CL6002D24SDR MASA20210628243Stringer · corrodedCORROSION ON STGR 26R BTW FS 333-349 AT E/E COMPARTMENT. STGR 26R BTW FS 333-364 AT E/E COMPARTMENT WAS REPLACED FOR A NEW ONE PER CRJ 900 SRM 51-42-06-001-001-A01.Jun 13, 2021 · N955 · Cndair CL6002D24SDR DALA2021061603272Longeron · corrodedAFT CARGO COMPARTMENT HAS CORROSION ON LONGERON 29L FROM STA 890 TO 930. *MARKED*. NRC 041-0008:5331-2001/017 00265: REPLACED LONGERON PER B717 SRM 53-20-05-2R AND SRM 53-00-05-2R. CLOSING REQUIREMENTS RII: INSPECTOR 00670737. (LP #1838627)Jun 13, 2021 · N924AT · Boeing 717200SDR SWIA202160605Stringer · corroded*CORROSION ON STGR 26L BETWEEN FS 310.00 - 295.00 (C-CHECK RO 8/18/2021) BLENDED OUT CORROSION ON STGR 26L BETWEEN F.S. 295.00 AND F.S. 310.00, BLENDED OUT CORROSION ON STGR 26L BETWEEN F.S. 295 AND 310.0 FOUND OUT OF LIMITS, MEASURED REMAINING MATERIALJun 12, 2021 · N804SK · Cndair CL6002D24SDR SWIA202160514Stringer · corroded*CORROSION ON STGR 26R SPLICE BETWEEN FS 319.00 - 333.00 (C-CHECK RO 8/18/2021) REMOVED AND REPLACED STGR 26R SPLICE BETWEEN F.S. 319.00 AND F.S. 333.00, REF CRJ 900 SRM 51-42-06-001-001-A01 AND DWG SH670-32420 REV -E. LEAK CHECK GOOD / COMPLIED WITH SKJun 12, 2021 · N804SK · Cndair CL6002D24SDR SWIA202160513Stringer · corroded*CORROSION ON STGR 26R BETWEEN FS 319.00 - 333.00 (C-CHECK RO 8/18/2021) REMOVED AND REPLACED WITH NEW STR 26 RH FROM FS280.00 - 333.00 REF CRJ 900 SRM 51-42-06-001-001-A01 AND 51-42-21-001-001-A01 DRAWING SH670-31630 REV K. LEAK CHECK GOOD / COMPLIED WJun 12, 2021 · N804SK · Cndair CL6002D24SDR SWIA202160512Stringer · corroded*CORROSION ON STGR 27 BETWEEN FS 310.00 - 295.00 (C-CHECK RO 8/18/2021) REMOVED AND REPLACED WITH NEW STGR 27 BETWEEN FS 280.00 TO 333.00 REF CRJ 900 SRM 51-42-06-001-001-A01 AND 51-42-21-001-001-A01 AND DRAWING SH670-31630 REV K. LEAK CHECK GOOD / COMPJun 12, 2021 · N804SK · Cndair CL6002D24SDR SWIA202160510Stringer Splice · corroded*CORROSION ON STGR 27 SPLICE AT FS 333.00 (C-CHECK RO 8/18/2021) REMOVED AND REPLACE WITH NEW STGR SPLICE AT FS333.00 REF CRJ 900 SRM 51-42-06-001-001-A01 AND DRAWING SH670-32420 REV E. LEAK CHECK GOOD. / COMPLIED WITH SKYWEST FORM M-337 / COMPLIED WITHJun 12, 2021 · N804SK · Cndair CL6002D24SDR SWIA202160509Stringer Splice · corroded*CORROSION ON STGR 26L SPLICE AT FS 333.00 (C-CHECK RO 8/18/2021) REMOVED AND REPLACED STGR 26L SPLICE AT F.S. 333.00, REF CRJ 900 SRM 51-42-06-001-001-A01 AND DWG SH670-32420 REV -E. LEAK CHECK GOOD / COMPLIED WITH SKYWEST TASK CARD 51-900-1002-SKY (CLJun 12, 2021 · N804SK · Cndair CL6002D24SDR SWIA202160508Stringer · corroded*CORROSION ON STGR 26L BETWEEN FS 333.00 - 319.00 (C-CHECK RO 8/18/2021) REMOVED AND REPLACED WITH STR 26 LH FROM FS280.00-FS333.00 REFCRJ 900 SRM 51-42-06-001-001-A01 REV 38 JUL 25/2020 AND 51-42-21-001-001-A01 REV 38 25/2020 DRAWING SH670-31630 REVJun 12, 2021 · N804SK · Cndair CL6002D24SDR SWIA2021082060505Stringer · corroded*CORROSION ON STGR 22L BETWEEN FS 333.00 - 349.00 (C-CHECK RO 8/18/2021) REPLACED STGR 22L BETWEEN FS333.00 TO FS349.00 REF DWG SH690-31350 REV. M, CRJ900 SRM 51-41-21-001-001-A01, CRJ900 SRM 51-42-06-001-001-A01, CRJ900 SRM 53-00-03-201-001-A02. LEAK CJun 12, 2021 · N804SK · Cndair CL6002D24SDR SWIA202160504Stringer · corroded*CORROSION ON STGR 19L BETWEEN FS 349.00 - 364.00 (C-CHECK RO 8/18/2021) REPAIRED CORROSION ON STGR 19L BETWEEN F.S. 349.00 AND F.S. 364.00, REF CRJ 900 SRM 53-00-03-201-001-A02, 51-42-06-001-001-A01 AND DWG SH670-31150 REV -F, LEAK CHECK GOOD / COMPLIJun 12, 2021 · N804SK · Cndair CL6002D24SDR SWIA202160501Stringer · corroded*CORROSION ON STGR 19L BETWEEN FS 319.00 - 333.00 (C-CHECK RO 8/18/2021) REMOVED AND REPLACED STGR 19L BETWEEN F.S. 310.00 AND F.S. 349.00, REF CRJ 900 SRM 51-42-06-001-001-A01, 51-42-21-001-001-A01 AND DWG SH670-31810 REV Y, LEAK CHECK GOOD. / COMPLIEDJun 12, 2021 · N804SK · Cndair CL6002D24SDR SWIA202160499Stringer · corroded*CORROSION ON STGR 21R BETWEEN FS 364.00 - 379.00 (C-CHECK RO 8/18/2021) REMOVED AND REPLACED CORRODED STGR 21R BETWEEN F.S. 333.0 AND F.S. 379.0, REF CRJ 900 SRM 51-42-06-001-001-A01, 51-42-21-001-001-A01 AND DWG SH670-31350 REV -A, LEAK CHECK GOOD / Jun 12, 2021 · N804SK · Cndair CL6002D24SDR SWAA2021071282558Stringer · crackedCRACK STRINGER 24R LOCATED BS 540 FWD CARGO COMPARTMENT ; 2021-282245 / [01] TOOL USED: CALIPER; P/N: 700-113-10; S/N: 0019306; DUE DATE: 14-OCT-21.; [02] TOOL USED PN 45MG; SN: 130061901; DUE DATE: 11-MAY-22; [03] TOOLS USED: TEMPERATURE CONTROLLER P/N: P3015Jun 12, 2021 · N749SW · Boeing 7377H4SDR SWAA2021071282568Stringer · crackedCRACK STRINGER 26L LOCATED BS 540 FWD CARGO COMPARTMENT ; 2021-282250 / [01] TOOL USED PN/ 25 DL PLUS; SN/ 071504410;DUE DATE/ 20NOV21; [02] TOOL USED P/N NORTEC500D S/N N500X11290U021704 DUE DATE: 08-OCT-21.; [03] TOOLS USED: TEMPERATURE CONTROLLER P/N: P3015Jun 12, 2021 · N749SW · Boeing 7377H4SDR SWAA2021071282561Stringer · crackedCRACK STRINGER 26R LOCATED BS 540 FWD CARGO COMPARTMENT ; 2021-282248 / [01] TOOL USED: CALIPER; P/N: 700-113-10; S/N: 0019306; DUE DATE: 14-OCT-21.; [02] TOOL USED PN 45MG; SN: 130061901; DUE DATE: 11-MAY-22; [03] TOOLS USED: TEMPERATURE CONTROLLER P/N: P3015Jun 12, 2021 · N749SW · Boeing 7377H4SDR SWAA2021071282559Stringer · crackedCRACK STRINGER 25R LOCATED BS 540 FWD CARGO COMPARTMENT ; 2021-282246 / [01] TOOL USED PN/ 25DL PLUS; SN/ 071504410; DUE DATE/ 20NOV21; [02] TOOL USED CALIPER P/N 500-197-30 S/N A18135101 DUE DATE 04 JUL 21; [03] TOOL USED P/N NORTEC500D S/N N500X11290U021704 Jun 12, 2021 · N749SW · Boeing 7377H4SDR CALA2021061400856Stringer Splice · corrodedPERFORM GVI INSP FIND AFT CGO COMPT JOINT STRINGER CORROSION AT FR47/51-FR52 S43L REF HAECO NON-ROUTINE NO.9440347,ORIGINATED BY EMP V906550. PERFORMED BY EMP V906550,REPLACED AFT CGO COMPT JOINT STRINGER COUPLING AS PER SRM 51-42-11 REV 137. RII BY TA327.Jun 12, 2021 · N4873U · Airbus A319132SDR SWIA2021082060496Stringer · corroded*CORROSION ON STGR 23L BETWEEN FS 1031.00 - 1051.00 (C-CHECK RO 8/18/2021) EVAL CORROSION IS 100% MATERIAL LOSS AND OUT OF LIMITS PER CRJ900 SRM 51-21-06-001-001-A01. REPAIRED STGR 23L PER CRJ900 SRM 53-00-03-201-001-A02. COMPLIED WITH TASK CARD 51-900Jun 11, 2021 · N804SK · Cndair CL6002D24SDR CALA2021061100848Stringer · corrodedREF HAECO LOG PAGE 9439516 AFT CARGO COMPARTMENT BILGE AREA FR60 -61 STGR 32L FOUND CORROSION. REF HAECO LOG PAGE 9439516 AFT CARG COMPARTMENT BILGE FR60-61 ST GR 32L CORRODED. STRINGER REPIRED AS PER SRM 53-00-13-300-001 RE V 135. THIS REPAIR APPROVED AS CATAJun 11, 2021 · N4873U · Airbus A319132SDR SWAA2021072282329Stringer · crackedCRACKED STRINGER END AT B.S. 537; STRINGER 23 LEFT. ; / [01] SRM 53-30-03-0I-1 IDENTIFICATION 1 AND SRM 53-00-03-2R-1 REPAIR 1 ARE APPLICABLE TO THIS A/C; [02] VERIFIED; SRM 53-30-03-0I-1 IDENTIFICATION 1 AND SRM 53-00-03-2R-1 REPAIR 1 ARE APPLICABLE TO THIS AJun 10, 2021 · N418WN · Boeing 7377H4
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