Alternatively you can apply this formula.
=IFNA(DROP(REDUCE("",SEQUENCE(ROWS(A1:A4)),
LAMBDA(u,v,VSTACK(u, HSTACK(CHOOSECOLS(A1:A4,v),
UNIQUE(TOCOL(CHOOSECOLS(B1:O4,v),1)),
BYROW(UNIQUE(TOCOL(CHOOSECOLS(B1:O4,v),1)),
LAMBDA(x,SUM(N(SCAN(0,CHOOSECOLS(B1:O4,v),
LAMBDA(ini,arr,IF(arr=x,ini+1,0)))=4)))))))),1),"")