### Instruction:

Extract the cause and effect entities from the following sentence:
When one of the events occurs, or when one of the boolean expressions evaluates to true, it is said that an event in the event block has occurred

### Assistant:

KEYWORD: when
VARIABLE: an event in the event block
CONDITION: has occurred
CAUSE_1: one of the events occurs
OR: or
NOT_RELEVANT: it is said that
EFFECT_1: an event in the event block has occurred
CAUSE_2: one of the boolean expressions evaluates to true

