dialogue: THEM: i need two balls and a hat . <eos> YOU: i need both hats . will you accept 2 balls and a book ? <eos> THEM: i'll just take the two balls , don't want the books . <eos> YOU: so i get both hats , both books , you just want the 2 balls ? <eos> THEM: <selection>
output: item0=2 item1=2 item2=0 item0=0 item1=0 item2=2