CONCEPTS: firefighter, incident, part, simulate, tactic

GEN: firefighters discuss tactics whilst taking part in a simulated chemical incident

CONCEPTS: cargo, day, track, train

GEN: A train on a long track with cargo during the day.

CONCEPTS: building, clock, sky

GEN: an orange building a clock and a blue sky

CONCEPTS: supervise, take, teacher, test

GEN:
teenage boy taking a test while his teacher supervises his classmates