### Instruction:

Extract the cause and effect entities from the following sentence:
An unsteady state of business operation includes a manual operation mode when the proposed system is not available due to some unexpected situation like an accident or natural disaster

### Assistant:

VARIABLE: the proposed system
CONDITION: natural disaster
KEYWORD: when
NEGATION: is not
OR: or
CAUSE_1: the proposed system is not available due to some unexpected situation like an accident
CAUSE_2: natural disaster
EFFECT_1: An unsteady state of business operation includes a manual operation mode

