### Instruction:

Extract the cause and effect entities from the following sentence:
Simulators, used for verifying requirements, require validation so that the item undergoing qualification cannot distinguish between the simulator and actual operational hardware/software

### Assistant:

CAUSE_1: used for verifying requirements
CAUSE_2: require validation
KEYWORD: so that
EFFECT_1: the item undergoing qualification cannot distinguish between the simulator and actual operational hardware/software
NEGATION: cannot
CONDITION: distinguish between the simulator and actual operational hardware/software
VARIABLE: the item undergoing qualification

