CONCEPTS: bridge, jogger, run

GEN: a jogger runs over across a bridge

CONCEPTS: flight, luggage, wait

GEN: people wait friday to check luggage and merchandise for a flight .

CONCEPTS: break, cloud, sky, sunlight

GEN: sky was covered with storm clouds through which seldom breaks sunlight

CONCEPTS: level, number, organism

GEN:
number of organisms at each trophic level