{ "schema": "canli.company-reference.v1", "cik": "0000072909", "name": "NORTHERN STATES POWER CO /WI/", "selection_policy": "extended-v23", "source_url": "https://data.sec.gov/api/xbrl/companyfacts/CIK0000072909.json", "source_sha256": "4370f5af10df18127f3af9543739dcd7d44a08898bee785347522050f8830bb2", "fetched_at": "2026-09-21T17:16:40.195Z", "policy": "Latest-filed annual-report facts per unit and reporting period at capture time. Duration facts cover 300 to 400 days. This selection can include restatements and is not a point-in-time backtest dataset. Missing concepts are omitted, never zero-filled. Values retain original units and are not currency converted. Extended concepts require compatible unit shapes and at least three reporting ends with changing values within one unit. Constant or incompatible added histories are omitted.", "claim_boundary": "Public company accounting reference, not market prices, returns, an investment recommendation, or ALPHAC performance. Validate a separately constructed return series with the validation API; accounting values are not returns.", "concepts": [ { "tag": "Assets", "taxonomy": "us-gaap", "label": "Total assets", "kind": "instant", "meaning": "Resources recognized on the balance sheet. Book assets are not the market value of the business.", "observations": [ { "end": "2025-12-31", "val": 4662000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "unit": "USD" }, { "end": "2024-12-31", "val": 4126000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "frame": "CY2024Q4I", "unit": "USD" }, { "end": "2023-12-31", "val": 3670000000, "accn": "0000072909-25-000004", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-02-27", "frame": "CY2023Q4I", "unit": "USD" }, { "end": "2022-12-31", "val": 3410000000, "accn": "0000072909-24-000004", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-21", "frame": "CY2022Q4I", "unit": "USD" }, { "end": "2021-12-31", "val": 3123000000, "accn": "0000072909-23-000003", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-23", "frame": "CY2021Q4I", "unit": "USD" }, { "end": "2020-12-31", "val": 2894000000, "accn": "0000072909-22-000003", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-23", "frame": "CY2020Q4I", "unit": "USD" }, { "end": "2019-12-31", "val": 2816000000, "accn": "0000072909-21-000006", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-17", "frame": "CY2019Q4I", "unit": "USD" }, { "end": "2018-12-31", "val": 2743500000, "accn": "0000072909-20-000003", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-02-21", "frame": "CY2018Q4I", "unit": "USD" }, { "end": "2017-12-31", "val": 2581700000, "accn": "0000072909-19-000004", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-02-22", "frame": "CY2017Q4I", "unit": "USD" }, { "end": "2016-12-31", "val": 2412840000, "accn": "0000072909-18-000011", "fy": 2017, "fp": "FY", "form": "10-K/A", "filed": "2018-07-27", "frame": "CY2016Q4I", "unit": "USD" }, { "end": "2015-12-31", "val": 2292607000, "accn": "0000072909-17-000003", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-02-24", "frame": "CY2015Q4I", "unit": "USD" }, { "end": "2014-12-31", "val": 2167120000, "accn": "0000072909-16-000018", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-02-22", "frame": "CY2014Q4I", "unit": "USD" }, { "end": "2013-12-31", "val": 1879393000, "accn": "0000072909-15-000003", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-02-23", "frame": "CY2013Q4I", "unit": "USD" }, { "end": "2012-12-31", "val": 1711085000, "accn": "0000072909-14-000003", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-02-24", "frame": "CY2012Q4I", "unit": "USD" }, { "end": "2011-12-31", "val": 1611471000, "accn": "0001140361-13-009153", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-02-25", "frame": "CY2011Q4I", "unit": "USD" }, { "end": "2010-12-31", "val": 1526528000, "accn": "0001140361-12-011184", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-02-27", "frame": "CY2010Q4I", "unit": "USD" } ] }, { "tag": "StockholdersEquity", "taxonomy": "us-gaap", "label": "Stockholders equity", "kind": "instant", "meaning": "The reported residual interest after liabilities. It is an accounting amount, not market capitalization.", "observations": [ { "end": "2025-12-31", "val": 1866000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "unit": "USD" }, { "end": "2024-12-31", "val": 1617000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "frame": "CY2024Q4I", "unit": "USD" }, { "end": "2023-12-31", "val": 1366000000, "accn": "0000072909-25-000004", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-02-27", "frame": "CY2023Q4I", "unit": "USD" }, { "end": "2022-12-31", "val": 1259000000, "accn": "0000072909-24-000004", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-21", "frame": "CY2022Q4I", "unit": "USD" }, { "end": "2021-12-31", "val": 1103000000, "accn": "0000072909-23-000003", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-23", "frame": "CY2021Q4I", "unit": "USD" }, { "end": "2020-12-31", "val": 1068000000, "accn": "0000072909-22-000003", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-23", "frame": "CY2020Q4I", "unit": "USD" }, { "end": "2019-12-31", "val": 967000000, "accn": "0000072909-21-000006", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-17", "frame": "CY2019Q4I", "unit": "USD" }, { "end": "2018-12-31", "val": 942400000, "accn": "0000072909-20-000003", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-02-21", "frame": "CY2018Q4I", "unit": "USD" }, { "end": "2017-12-31", "val": 876600000, "accn": "0000072909-19-000004", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-02-22", "frame": "CY2017Q4I", "unit": "USD" }, { "end": "2016-12-31", "val": 811850000, "accn": "0000072909-18-000011", "fy": 2017, "fp": "FY", "form": "10-K/A", "filed": "2018-07-27", "frame": "CY2016Q4I", "unit": "USD" }, { "end": "2015-12-31", "val": 790385000, "accn": "0000072909-17-000003", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-02-24", "frame": "CY2015Q4I", "unit": "USD" }, { "end": "2014-12-31", "val": 697689000, "accn": "0000072909-16-000018", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-02-22", "frame": "CY2014Q4I", "unit": "USD" }, { "end": "2013-12-31", "val": 604282000, "accn": "0000072909-15-000003", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-02-23", "frame": "CY2013Q4I", "unit": "USD" }, { "end": "2012-12-31", "val": 517106000, "accn": "0000072909-14-000003", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-02-24", "frame": "CY2012Q4I", "unit": "USD" } ] }, { "tag": "CashAndCashEquivalentsAtCarryingValue", "taxonomy": "us-gaap", "label": "Cash and cash equivalents", "kind": "instant", "meaning": "Cash and qualifying short-term liquid investments under the filer’s accounting policy. 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Check the filing for attribution, exceptional items and discontinued operations before comparing companies.", "observations": [ { "start": "2025-01-01", "end": "2025-12-31", "val": 158000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "frame": "CY2025", "unit": "USD" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 134000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "frame": "CY2024", "unit": "USD" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 136000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "frame": "CY2023", "unit": "USD" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 125000000, "accn": "0000072909-25-000004", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-02-27", "frame": "CY2022", "unit": "USD" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 108000000, "accn": "0000072909-24-000004", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-21", "frame": "CY2021", "unit": "USD" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 107000000, "accn": "0000072909-23-000003", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-23", "frame": "CY2020", "unit": "USD" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 79000000, "accn": "0000072909-22-000003", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-23", "frame": "CY2019", "unit": "USD" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 98000000, "accn": "0000072909-21-000006", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-17", "frame": "CY2018", "unit": "USD" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 79400000, "accn": "0000072909-20-000003", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-02-21", "frame": "CY2017", "unit": "USD" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 69100000, "accn": "0000072909-19-000004", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-02-22", "frame": "CY2016", "unit": "USD" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 74636000, "accn": "0000072909-18-000011", "fy": 2017, "fp": "FY", "form": "10-K/A", "filed": "2018-07-27", "frame": "CY2015", "unit": "USD" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 70642000, "accn": "0000072909-17-000003", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-02-24", "frame": "CY2014", "unit": "USD" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 59468000, "accn": "0000072909-16-000018", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-02-22", "frame": "CY2013", "unit": "USD" }, { "start": "2012-01-01", "end": "2012-12-31", "val": 49951000, "accn": "0000072909-15-000003", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-02-23", "frame": "CY2012", "unit": "USD" }, { "start": "2011-01-01", "end": "2011-12-31", "val": 51006000, "accn": "0000072909-14-000003", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-02-24", "frame": "CY2011", "unit": "USD" }, { "start": "2010-01-01", "end": "2010-12-31", "val": 42749000, "accn": "0001140361-13-009153", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-02-25", "frame": "CY2010", "unit": "USD" }, { "start": "2009-01-01", "end": "2009-12-31", "val": 47363000, "accn": "0001140361-12-011184", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-02-27", "frame": "CY2009", "unit": "USD" } ] }, { "tag": "NetCashProvidedByUsedInOperatingActivities", "taxonomy": "us-gaap", "label": "Operating cash flow", "kind": "duration", "meaning": "Cash generated or used by operating activities. 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Restricted amounts are not freely available, so this is not the same as unrestricted cash.", "observations": [ { "end": "2025-12-31", "val": 8000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "unit": "USD" }, { "end": "2024-12-31", "val": 8000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "unit": "USD" }, { "end": "2023-12-31", "val": 6000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "frame": "CY2023Q4I", "unit": "USD" }, { "end": "2022-12-31", "val": 2000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "frame": "CY2022Q4I", "unit": "USD" }, { "end": "2021-12-31", "val": 11000000, "accn": "0000072909-25-000004", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-02-27", "frame": "CY2021Q4I", "unit": "USD" }, { "end": "2020-12-31", "val": 2000000, "accn": "0000072909-24-000004", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-21", "frame": "CY2020Q4I", "unit": "USD" }, { "end": "2019-12-31", "val": 1000000, "accn": "0000072909-23-000003", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-23", "frame": "CY2019Q4I", "unit": "USD" }, { "end": "2018-12-31", "val": 2000000, "accn": "0000072909-22-000003", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-23", "frame": "CY2018Q4I", "unit": "USD" }, { "end": "2017-12-31", "val": 1000000, "accn": "0000072909-21-000006", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-17", "frame": "CY2017Q4I", "unit": "USD" } ] }, { "tag": "AccumulatedOtherComprehensiveIncomeLossNetOfTax", "taxonomy": "us-gaap", "label": "Accumulated other comprehensive income or loss", "kind": "instant", "unitKind": "money", "meaning": "Cumulative other comprehensive items after tax, such as translation and unrealized hedging or securities effects. 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It differs from income tax expense and can reflect prior years and estimated payments.", "observations": [ { "start": "2025-01-01", "end": "2025-12-31", "val": -16000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "frame": "CY2025", "unit": "USD" }, { "start": "2024-01-01", "end": "2024-12-31", "val": -36000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "frame": "CY2024", "unit": "USD" }, { "start": "2023-01-01", "end": "2023-12-31", "val": -40000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "frame": "CY2023", "unit": "USD" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 32000000, "accn": "0000072909-25-000004", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-02-27", "frame": "CY2022", "unit": "USD" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 22000000, "accn": "0000072909-24-000004", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-21", "frame": "CY2021", "unit": "USD" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 26000000, "accn": "0000072909-23-000003", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-23", "frame": "CY2020", "unit": "USD" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 0, "accn": "0000072909-22-000003", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-23", "frame": "CY2019", "unit": "USD" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 21000000, "accn": "0000072909-21-000006", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-17", "frame": "CY2018", "unit": "USD" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 5000000, "accn": "0000072909-20-000003", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-02-21", "frame": "CY2017", "unit": "USD" }, { "start": "2016-01-01", "end": "2016-12-31", "val": -5900000, "accn": "0000072909-19-000004", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-02-22", "frame": "CY2016", "unit": "USD" }, { "start": "2015-01-01", "end": "2015-12-31", "val": -5762000, "accn": "0000072909-18-000011", "fy": 2017, "fp": "FY", "form": "10-K/A", "filed": "2018-07-27", "frame": "CY2015", "unit": "USD" }, { "start": "2014-01-01", "end": "2014-12-31", "val": -3474000, "accn": "0000072909-17-000003", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-02-24", "frame": "CY2014", "unit": "USD" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 9842000, "accn": "0000072909-16-000018", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-02-22", "frame": "CY2013", "unit": "USD" }, { "start": "2012-01-01", "end": "2012-12-31", "val": 5841000, "accn": "0000072909-15-000003", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-02-23", "frame": "CY2012", "unit": "USD" }, { "start": "2011-01-01", "end": "2011-12-31", "val": -1116000, "accn": "0000072909-14-000003", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-02-24", "frame": "CY2011", "unit": "USD" }, { "start": "2010-01-01", "end": "2010-12-31", "val": -4371000, "accn": "0001140361-13-009153", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-02-25", "frame": "CY2010", "unit": "USD" }, { "start": "2009-01-01", "end": "2009-12-31", "val": 30011000, "accn": "0001140361-12-011184", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-02-27", "frame": "CY2009", "unit": "USD" } ] }, { "tag": "IncreaseDecreaseInInventories", "taxonomy": "us-gaap", "label": "Change in inventories", "kind": "duration", "unitKind": "money", "meaning": "The cash flow adjustment for the change in inventories during the period. A positive value under this concept means inventory grew and reduced operating cash flow.", "observations": [ { "start": "2025-01-01", "end": "2025-12-31", "val": 22000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "frame": "CY2025", "unit": "USD" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 12000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "frame": "CY2024", "unit": "USD" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 6000000, "accn": "0000072909-26-000003", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-25", "frame": "CY2023", "unit": "USD" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 14000000, "accn": "0000072909-25-000004", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-02-27", "frame": "CY2022", "unit": "USD" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 12000000, "accn": "0000072909-24-000004", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-21", "frame": "CY2021", "unit": "USD" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 5000000, "accn": "0000072909-23-000003", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-23", "frame": "CY2020", "unit": "USD" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 8000000, "accn": "0000072909-22-000003", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-23", "frame": "CY2019", "unit": "USD" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 8000000, "accn": "0000072909-21-000006", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-17", "frame": "CY2018", "unit": "USD" }, { "start": "2017-01-01", "end": "2017-12-31", "val": -600000, "accn": "0000072909-20-000003", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-02-21", "frame": "CY2017", "unit": "USD" }, { "start": "2016-01-01", "end": "2016-12-31", "val": -3300000, "accn": "0000072909-19-000004", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-02-22", "frame": "CY2016", "unit": "USD" }, { "start": "2015-01-01", "end": "2015-12-31", "val": -3126000, "accn": "0000072909-18-000011", "fy": 2017, "fp": "FY", "form": "10-K/A", "filed": "2018-07-27", "frame": "CY2015", "unit": "USD" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 3210000, "accn": "0000072909-17-000003", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-02-24", "frame": "CY2014", "unit": "USD" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 1879000, "accn": "0000072909-16-000018", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-02-22", "frame": "CY2013", "unit": "USD" }, { "start": "2012-01-01", "end": "2012-12-31", "val": -6018000, "accn": "0000072909-15-000003", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-02-23", "frame": "CY2012", "unit": "USD" }, { "start": "2011-01-01", "end": "2011-12-31", "val": -913000, "accn": "0000072909-14-000003", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-02-24", "frame": "CY2011", "unit": "USD" }, { "start": "2010-01-01", "end": "2010-12-31", "val": -1827000, "accn": "0001140361-13-009153", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-02-25", "frame": "CY2010", "unit": "USD" }, { "start": "2009-01-01", "end": "2009-12-31", "val": -11033000, "accn": "0001140361-12-011184", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-02-27", "frame": "CY2009", "unit": "USD" } ] }, { "tag": "IncreaseDecreaseInAccountsPayable", "taxonomy": "us-gaap", "label": "Change in accounts payable", "kind": "duration", "unitKind": "money", "meaning": "The cash flow adjustment for the change in payables during the period. 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