### Instruction:

Extract the cause and effect entities from the following sentence:
The LAD Nominal Field of Regard (FoR) should be at least 75% of the sky at the beginning of the Nominal Operations Phase

### Assistant:

KEYWORD: at
CONDITION: should be at least 75% of the sky
VARIABLE: The LAD Nominal Field of Regard
CAUSE_1: the beginning of the Nominal Operations Phase
NOT_RELEVANT: (FoR)
EFFECT_1: should be at least 75% of the sky

