### Instruction:

Extract the cause and effect entities from the following sentence:
An implementation may not require all aspects of the architecture; therefore, all requirements may not apply to each STRS-compliant software defined radio

### Assistant:

VARIABLE: all requirements
NEGATION: may not
CONDITION: apply to each STRS-compliant software defined radio
KEYWORD: therefore
EFFECT_1: all requirements may not apply to each STRS-compliant software defined radio
CAUSE_1: An implementation may not require all aspects of the architecture

