### Instruction:

Extract the cause and effect entities from the following sentence:
A list of contact persons at the customer (and at the contractor, if known) has to be added in order to complete the information

### Assistant:

VARIABLE: the information
NOT_RELEVANT: (and at the contractor, if known)
CONDITION: to complete
KEYWORD: in order
EFFECT_1: to complete the information
CAUSE_1: has to be added


### END
