Comma Separated List

Hi Asking 
This not as simple as it sounds. The reason is that there is no column to slice by. Long story short, please refer to attched file and following screenshots. You have to have either index or Date column. If don't, then use power query to add an index column. Please let me know if you need any further help.

Combination = 
VAR T1 =
    SUMMARIZE (
        'Table',
        'Table'[Column1],
        "@Index", MAX ( 'Table'[Index] ),
        "@Combination", CONCATENATEX ( 'Table', 'Table'[Column2], "," )
    )
VAR T2 =
    SUMMARIZE ( 
        T1, 
        [@Combination],
        "@@Index", MAX ( 'Table'[Index] )
    )
VAR T3 =
    ADDCOLUMNS ( 
        T2,
        "@Rank", RANKX ( T2, [@@Index],, ASC, Dense ) 
    )
RETURN
    MAXX ( 
        FILTER ( T3, [@Rank] = SELECTEDVALUE ( 'Table 2'[Value] ) ),
        [@Combination]
    )

Count = 
VAR T1 =
    SUMMARIZE (
        'Table',
        'Table'[Column1],
        "@Index", MAX ( 'Table'[Index] ),
        "@Combination", CONCATENATEX ( 'Table', 'Table'[Column2], "," )
    )
VAR T2 =
    SUMMARIZE ( 
        T1, 
        [@Combination],
        "@@Index", MAX ( 'Table'[Index] ),
        "@Count", COUNTROWS ( FILTER ( T1, [@Combination] = EARLIER ( [@Combination] ) ) )
    )
VAR T3 =
    ADDCOLUMNS ( 
        T2,
        "@Rank", RANKX ( T2, [@@Index],, ASC, Dense ) 
    )
RETURN
    MAXX ( 
        FILTER ( T3, [@Rank] = SELECTEDVALUE ( 'Table 2'[Value] ) ),
        [@Count]
    )