CONCEPTS: contain, envelope, letter

GEN: empty envelopes that contained letters

CONCEPTS: flower, garden, stem

GEN: the pretty orchid flower in the garden it has purple petals with green stems

CONCEPTS: gate, giraffes, stand

GEN: Two giraffes surrounded by a gate standing next to each other.

CONCEPTS: sit, track, vehicle

GEN:
A train maintenance vehicle sits on train tracks.