group = Table.Group(
       Source,
       last_5,
       {{"x", (x) => Table.Skip(Table.SelectColumns(x, first_7))}, {"count", Table.RowCount}},
       GroupKind.Local,
       (s, c) => Number.From(c[Дата акта] <> null)
   )

src=Excel.CurrentWorkbook(){0}[Content]{0}[Column1]

src=Excel.CurrentWorkbook(){[Name="path"]}[Content]{0}[Column1]

let
    src = Table.SelectColumns(Table.SelectRows(Excel.CurrentWorkbook(), each [Name]="data"), "Content"),
    getReadySpoolsColumns = {"1", "3", "4", "9", "10", "126", "12", "23", "28", "34", "39", "47", "115"},
    pt1 = Table.TransformColumns(src, {"Content", each Table.SelectColumns(Table.PromoteHeaders(_), getReadySpoolsColumns)}),
    expandContent = Table.ExpandTableColumn(pt1, "Content", Table.ColumnNames(pt1[Content]{0}), Table.ColumnNames(pt1[Content]{0})),
    pt2 = Table.ReplaceValue(expandContent,"",null,Replacer.ReplaceValue, Table.ColumnNames(pt1[Content]{0})),
    pt3 = Table.SelectRows(pt2, each [10] <> null and [10] <> ""),
    pt4 = Table.TransformColumns(pt3,{{"3", Text.Lower, type text}, {"4", Text.Lower, type text}, {"9", Text.Lower, type text}, {"10", Text.Lower, type text}, {"126", Text.Lower, type text}, {"12", Text.Lower, type text}, {"28", Text.Lower, type text}, {"39", Text.Lower, type text}}),
    pt5 = Table.CombineColumns(pt4,{"3", "4", "9"},Combiner.CombineTextByDelimiter("-", QuoteStyle.None),"zls"),
    pt6 = Table.TransformColumnTypes(pt5,{{"23", Int64.Type}, {"34", Int64.Type}, {"47", type date}}),
    replErrors = Table.ReplaceErrorValues(pt6, {{"23", null}, {"34", null}}),
    pt7 = Table.RemoveColumns(Table.SelectRows(replErrors, each not Text.Contains([10], "sup") and ([126]<>"ремонт" and [126]<>"tur. ремонт") and [115]<>"не получено"), {"115","126"}),
    pt8 = Table.ReplaceValue(pt7, each [28], each if Text.Contains([28],"gm", Comparer.OrdinalIgnoreCase) then 1 else null,Replacer.ReplaceValue,{"28"}),
    pt9 = Table.ReplaceValue(pt8, each [39], each if Text.Contains([39],"gm", Comparer.OrdinalIgnoreCase) then 1 else null,Replacer.ReplaceValue,{"39"}),
    pt10 = Table.AddColumn(pt9, "ready", each 
        if [47]<>null 
        then "готов"
        else 
            if (Text.Start([10],2)="fw" and (([23]<>null and [28]<>null and [34]<>null and [39]=null) or ([23]<>null and [28]=null and [34]<>null and [39]<>null) or ([23]<>null and [28]<>null and [34]<>null and [39]<>null))) 
            then "готов*"
            else 
                if (Text.Start([10],2)="fw" and (([23]<>null and [28]<>null and [34]=null and [39]=null) or ([23]=null and [28]=null and [34]<>null and [39]<>null)))
                then "готов"
                else null),
    pt11 = Table.AddColumn(pt10, "jointWithMaterial", each if [23]<>null or [34]<>null then 1 else 0),
    groupData = Table.Group(pt11, {"zls"}, {{"data", each _, type table [zls=text, 10=text, 12=text, 23=nullable number, 28=nullable number, 34=nullable number, 39=nullable number, 47=nullable date, ready=nullable text, jointWithMaterial=number]}}),
    pt12 = Table.AddColumn(groupData, "ready", each 
        if List.Count(List.RemoveNulls([data][ready]))>0
        then if (List.Count(Table.SelectRows([data], each [jointWithMaterial]=1)[jointWithMaterial]) = List.Count(List.RemoveNulls(Table.SelectRows([data], each [jointWithMaterial]=1)[ready]))) 
            then "WFO" 
            else null
        else null),
    pt13 = Table.Buffer(Table.SelectRows(Table.RemoveColumns(pt12,{"data"}), each [ready]<>null)),
    pt14 = Table.SelectColumns(pt7, {"1", "zls", "10", "12"}),
    pt15 = Table.AddColumn(pt14, "wfo1", each try pt13[ready]{List.PositionOf(pt13[zls],[zls])} otherwise null),
    pt16 = Table.AddColumn(pt15, "wfo2", each try pt13[ready]{List.PositionOf(pt13[zls],[12])} otherwise null),
    pt17 = Table.AddColumn(pt16, "wfo", each if [wfo1]<>null and [wfo2]<>null then "WFO" else null),
    pt18 = Table.SelectRows(Table.SelectColumns(pt17, {"1","wfo"}), each [wfo]<>null)
in
    pt18

Table.CombineColumns(Источник,{"data1", "data2"},Combiner.CombineTextByDelimiter("", QuoteStyle.None),"Сведено")

c=List.Difference(b,{y}){0}?,