Generate new column (string) with compose of the same ID in different rows and excluded duplicate string

[#1]

Hi,

I want to generate a new column that combines the strings in the same ID in different rows as the example table (I want column results). Thank you

ID	Ab	results
1	A2, B3	A2, B3, B56, C7, DR5
1	A2, B56, C7, DR5	A2, B3, B56, C7, DR5
1	DR5	A2, B3, B56, C7, DR5
2	A56, B9, C0, DQ89	A56, B9, C0, DQ89
2		A56, B9, C0, DQ89
2	DQ89	A56, B9, C0, DQ89
3	A2	A2, DR5
3	DR5	A2, DR5
3		A2, DR5

[#2]

Here is the formula I worked out.  Others may have better ways

curID = :ID;
theRows = Current Data Table() << get rows where( :ID == curID );
theArray = Associative Array( Words( Concat Items( :Ab[theRows] ), ", " ) );
Concat Items( theArray << get keys );

[#3]

Here is an approach via Tables/Summary:
🙏 Summary and Tabulate: add aggregation option for Character columns