### Instruction:

Extract the cause and effect entities from the following sentence:
E_i and E_k are the atomic oxygen energy levels from which the transition wavelengths are derived

### Assistant:

VARIABLE: the transition wavelengths
AND: and
CONDITION: are derived
KEYWORD: from which
CAUSE_1: E_i
CAUSE_2: E_k are the atomic oxygen energy levels
EFFECT_1: the transition wavelengths are derived

