Segment-based reference chain

Round 3 (go to game round)

B: subway train with man in grey hair on right side

A: no man with gray hair

Round 4 (go to game round)

A: asian men in suits

B: man with grey hair and subway again

B: yes

A: i have man with gray hair

Round 5 (go to game round)

B: grey hair man

A: gray hair man

A: yes i have gray hair man