In film, a sequence is a series of scenes that form a distinct narrative unit, which is usually connected either by unity of location or unity of time. For example a heist film might include an extended recruitment sequence in which the leader of the gang collects together the conspirators, a robbery sequence, an escape sequence, and so on. Each of these sequences might further contain sub-sequences; for example the robbery sequence might consist of an entry sequence, a safe-cracking sequence, and so on.