### Instruction:

Extract the cause and effect entities from the following sentence:
Materials, goods and services shall only be procured from suppliers / subcontractors which the Provider has approved

### Assistant:

CAUSE_1: the Provider has approved
VARIABLE: the Provider
EFFECT_2: goods
EFFECT_3: services shall only be procured from suppliers / subcontractors
AND: and
KEYWORD: which
EFFECT_1: Materials
CONDITION: has approved

