### Instruction:

Extract the cause and effect entities from the following sentence:
None of the considered technologies were fully recommended primarily due to concerns about the operational compatibility (spectrum interference) with existing systems in the L-band and/or because of lack of sufficient technical maturity

### Assistant:

NEGATION: None of the
VARIABLE: sufficient technical maturity
CONDITION: lack of
KEYWORD: because of
AND: and
OR: or
EFFECT_1: None of the considered technologies were fully recommended
CAUSE_1: concerns about the operational compatibility (spectrum interference) with existing systems in the L-band
CAUSE_2: lack of sufficient technical maturity

