CONCEPTS: mushroom, onion, pizza

GEN: A piece of pizza in the box with cheese, mushrooms, and onions.

CONCEPTS: classroom, pupil, talk, teacher

GEN: teacher talking with her pupils in the classroom

CONCEPTS: diagram, extent, illustrate

GEN: this diagram illustrates the extent of the largest ring discovered by satellite

CONCEPTS: fall, station, track

GEN:
the victim fell onto the tracks near station .