### Instruction:

Extract the cause and effect entities from the following sentence:
If a change in state of a source for the core program is observed, LOFT may be pointed to this source and repeated observations are feasible till the source state is no longer of interest

### Assistant:

KEYWORD: till
VARIABLE: the source state
CONDITION: longer of interest
AND: and
NEGATION: no
CAUSE_1: a change in state of a source for the core program is observed
EFFECT_1: LOFT may be pointed to this source
EFFECT_2: repeated observations are feasible
CAUSE_2: the source state is no longer of interest

