Objects in the image:
category: person
category: person
category: backpack
category: train
category: person
category: backpack
category: person

Guessing-game dialogue about one of the objects:
q: is it front?
a: No
q: is it person?
a: Yes
q: is it front?
a: No
q: is it person?
a: Yes
q: are they in right?
a: Yes
q: is front walking?
a: No
q: is in back with bag?
a: No
q: is in train?
a: No
q: is in backmost?
a: Yes