### Instruction:

Extract the cause and effect entities from the following sentence:
The TMT Observatory in steady-state operation shall use no more than 24 nights per year for scheduled engineering time

### Assistant:

VARIABLE: operation
KEYWORD: in
CONDITION: shall use no more than 24 nights per year for scheduled engineering time
EFFECT_1: shall use no more than 24 nights per year for scheduled engineering time
CAUSE_1: steady-state operation

