Concepts: pigeon, sky, tree
A: a flock of pigeons gather in tree against clear blue sky
Concepts: bathroom, sit, stall, toilet
A: This toilet sits in a stall in a public bathroom
Concepts: helmet, motorcyclist, traffic
A: Two motorcyclists in helmets enter traffic on a freeway.
Concepts: hydrant, middle, paint
A:
A fie hydrant is painted green on top, white in the middle, and red on the bottom.