### Instruction:

Extract the cause and effect entities from the following sentence:
Interface filters shall be used on outlet lines if it is determined that any operations, such as the servicing or deservicing of fluids, could permit flow in a reverse direction

### Assistant:

KEYWORD: if
VARIABLE: Interface filters
NOT_RELEVANT: it is determined that
CONDITION: shall be used on outlet lines
EFFECT_1: Interface filters shall be used on outlet lines
CAUSE_1: could permit flow in a reverse direction


### END
