### Instruction:

Extract the cause and effect entities from the following sentence:
Neither the original (i.e., essential) TSRV FCS requirements nor the evolution of the baseline software are well documented, thus the “essence” of the system was backed out of the existing implementation

### Assistant:

NEGATION: nor
VARIABLE: the “essence” of the system
NOT_RELEVANT: (i.e., essential)
CONDITION: was backed out of the existing implementation
KEYWORD: thus
CAUSE_1: TSRV FCS requirements
CAUSE_2: nor the evolution of the baseline software are well documented
EFFECT_1: the “essence” of the system was backed out of the existing implementation

