### Instruction:

Extract the cause and effect entities from the following sentence:
Rationale: Crewmembers must maintain voice communication with ground systems during nominal and off-nominal activities

### Assistant:

NOT_RELEVANT: Rationale
EFFECT_1: Crewmembers must maintain voice communication with ground systems
KEYWORD: during
CAUSE_1: nominal
CAUSE_2: off-nominal activities
AND: and
VARIABLE: activities
CONDITION: off-nominal


### END
