### Instruction:

Extract the cause and effect entities from the following sentence:
Site supervision and the supervision of operatives and sub-contractors shall be at a level to ensure compliance with safety and technical requirements

### Assistant:

CAUSE_1: Site supervision and the supervision of operatives and sub-contractors shall be at a level
EFFECT_1: to ensure compliance with safety
AND: and
EFFECT_2: technical requirements
VARIABLE: Site supervision and the supervision of operatives and sub-contractors
CONDITION: shall be at a level

