CONCEPTS: airport, hail, taxi, traveler

GEN: hand of traveler hailing a taxi outside the airport

CONCEPTS: enlightenment, pray, tree

GEN: monks praying under the bodhi tree where author reached enlightenment

CONCEPTS: crash, plane, tower

GEN: a plane hijacked by terrorists crashed into north tower .

CONCEPTS: festival, performance, student

GEN:
students after their performance at festival .