### Instruction:

Extract the cause and effect entities from the following sentence:
Therefore, only technologies with estimated Technology Readiness Levels (TRL) of at least 5 by the end of the Phase A/B1 (estimated at the end of 2015) may be used

### Assistant:

NOT_RELEVANT: (estimated at the end of 2015)
KEYWORD: by
VARIABLE: the Phase A/B1
CONDITION: may be used
CAUSE_1: technologies with estimated Technology Readiness Levels (TRL) of at least 5
CAUSE_2: the end of the Phase A/B1
EFFECT_1: may be used

