### Instruction:

Extract the cause and effect entities from the following sentence:
One could think of the following survey strategy: if the catalogue selection is a random fraction of for example 33%, then 120 exposures of a given field would give an average total integration time of 6.3x6.3=40 exposures for all galaxy candidates in the field (2 mag = factor 6.3)

### Assistant:

NOT_RELEVANT: (2 mag = factor 6.3)
KEYWORD: then
VARIABLE: 120 exposures of a given field
CONDITION: would give an average total integration time of 6.3x6.3=40 exposures for all galaxy candidates in the field
CAUSE_1: the catalogue selection is a random fraction of for example 33%
EFFECT_1: 120 exposures of a given field would give an average total integration time of 6.3x6.3=40 exposures for all galaxy candidates in the field

