$ OUT=$(smenu -T, t0012.in)

abc ab ab abcabc bca ba bac 
0:0423 1:04 2:0423 10:23 12:23 17:07 18:07 19:07 24:04 25:0423 26:0423 
$ 

$ echo ":$OUT:"

:abc,bac:

$ exit 0