### Instruction:

Extract the cause and effect entities from the following sentence:
Once installed, the CTS must maintain cargo services, if required, until the cargo is removed for transfer to the ISS

### Assistant:

CAUSE_2: the cargo is removed for transfer to the ISS
KEYWORD: Once
CAUSE_1: installed
EFFECT_1: the CTS must maintain cargo services
VARIABLE: the CTS
CONDITION: installed

