### Instruction:

Extract the cause and effect entities from the following sentence:
Rationale: Gateway EVA is available on a contingency basis only, therefore any external ORUs must plan for robotics to be the primary means for installation and removal

### Assistant:

NOT_RELEVANT: Rationale
CAUSE_1: Gateway EVA is available on a contingency basis only
KEYWORD: therefore
EFFECT_1: any external ORUs must plan for robotics to be the primary means for installation
AND: and
EFFECT_2: removal
VARIABLE: any external ORUs
CONDITION: removal

