### Instruction:

Extract the cause and effect entities from the following sentence:
In the case where an EIRENE mobile attempts to make a Railway emergency call over a public network, the ability to pre-empt lower priority calls (particularly public emergency calls) may be inhibited, unless a special agreement is in place

### Assistant:

KEYWORD: where
NOT_RELEVANT: (particularly public emergency calls)
VARIABLE: a special agreement
CONDITION: is in place
CAUSE_1: an EIRENE mobile attempts to make a Railway emergency call over a public network
EFFECT_1: may be inhibited
NEGATION: unless
CAUSE_2: a special agreement is in place

