### Instruction:

Extract the cause and effect entities from the following sentence:
In fatigue design, it is the ratio of the calculated fatigue life to the allowable design life

### Assistant:

CAUSE_1: In fatigue design
EFFECT_1: it is the ratio of the calculated fatigue life to the allowable design life
VARIABLE: In fatigue design
CONDITION: is the ratio of the calculated fatigue life to the allowable design life

