CONCEPTS: clash, demonstration, police, protester

GEN: cameraman films as police and protesters clash at the demonstration

CONCEPTS: flow, footage, waterfall

GEN: waterfalls flowing through the jungle in high definition footage with ambient audio

CONCEPTS: day, runway, sit

GEN: A plane sits on a runway on a clear day.

CONCEPTS: harvest, harvester, maize

GEN:
a combine harvester harvests a field of maize