### Instruction:

Extract the cause and effect entities from the following sentence:
Some ground segment maintenance may not be achievable without service interruption (e.g. to swap between a prime and redundant service)

### Assistant:

VARIABLE: service interruption
NEGATION: may not
CONDITION: be achievable
KEYWORD: without
NOT_RELEVANT: (e.g. to swap between a prime and redundant service)
EFFECT_1: Some ground segment maintenance may not be achievable
CAUSE_1: service interruption

