CONCEPTS: cloud, sky, south

GEN: long thin undulating clouds were moving rapidly across the sky from the south .

CONCEPTS: sample, shore, take

GEN: students taking samples from the shore

CONCEPTS: pepper, pizza, topping

GEN: Fresh mushrooms, tomatoes and green pepper are the vegetable toppings on this pizza.

CONCEPTS: meadow, sheep, shepherd

GEN:
a shepherd leading his sheep to the meadows .