### Instruction:

Extract the cause and effect entities from the following sentence:
Rationale: Emergency systems, EVA or emergency operations cannot be used as a leg of failure tolerance as these emergency systems and equipment cannot definitively prevent an initiating event

### Assistant:

NOT_RELEVANT: Rationale
EFFECT_1: Emergency systems
EFFECT_2: EVA
EFFECT_3: emergency operations cannot be used as a leg of failure tolerance
CAUSE_1: these emergency systems
CAUSE_2: equipment cannot definitively prevent an initiating event
AND: and
KEYWORD: as
VARIABLE: equipment
OR: or
NEGATION: cannot
CONDITION: definitively prevent an initiating event

