dialogue: YOU: i'd like ball and 1 book . <eos> THEM: how about 1 ball ? <eos> YOU: hats are worthless to me . i have to have a ball and a book . <eos> THEM: okay just one book and 1 ball then <eos> YOU: <selection>
output: item0=1 item1=0 item2=1 item0=1 item1=3 item2=0