CONCEPTS: bay, run, trail

GEN: trails run along a high ridge in the east bay .

CONCEPTS: air, preform, stunt

GEN: A skilled skier preforms a stunt while in mid air.

CONCEPTS: classroom, portrait, teacher

GEN: portrait of a female teacher in a classroom

CONCEPTS: math, student, teacher

GEN:
student doing maths on the blackboard with teacher overseeing