Spreadsheet formula using two variable in two array

This is a follow-up to my previous post

However, as I test further, when the combination table only has one row. The result was not as expected.

Original Data

Col1	Col2	Col3	Col4	Col5
A	aawek	ert	gh	dsfg
B	asfdklj	vnv	ghc	dfgs
D	sadf	dsfg	sfdg	hgdfh
E	erty	dfsg	sdfg	gfhre
F	tyher	dsfg	sdfg	dfsg

Combination of Col1

1	2
A	B

Using the following function as suggested in previous post:

=let(Σ,filter(A13:B,A13:A<>""),Λ,A4:E8,    reduce(tocol(,1),sequence(rows(Σ)),lambda(a,c,vstack(a,filter(Λ,xmatch(choosecols(Λ,1),index(Σ,c))),wraprows(rept("*",5),columns(Λ),rept("*",5))))))

https://docs.google.com/spreadsheets/d/1cuNkoR4Rn7Lt0u-aCB4487JnucMKYgx0ETn6R_w7-ds/edit?usp=sharing

Expected Result

Col1	Col2	Col3	Col4	Col5
A	aawek	ert	gh	dsfg
B	asfdklj	vnv	ghc	dfgs
*****	*****	*****	*****	*****

Actual Result

Col1	Col2	Col3	Col4	Col5
A	aawek	ert	gh	dsfg
*****	*****	*****	*****	*****

I tried to alter every variable in the formula but in vain.

Solution

You can use:

=REDUCE(A3:E3,SEQUENCE(COUNTA(A13:A)),LAMBDA(a,i,IFNA(VSTACK(a,
  FILTER(A4:E8,REGEXMATCH(A4:A8,"^("&JOIN("|",INDEX(A13:B,i))&")$")),
  "*****"),"*****")))