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

abc ab ab abcabc bca ba bac 
0:23 2:23 4:07 5:07 10:0423 11:04 12:0423 13:04 14:04 15:04 24:04 25:0423 26:0423 
$ 

$ echo ":$OUT:"

:abcabc,bac:

$ exit 0