### Instruction:

Extract the cause and effect entities from the following sentence:
Because of the limitations and constraints of implementing data communications using VDL Mode 2 over a congested aeronautical VHF band, FAA Data Comm Program will focus on implementing the certain critical air traffic services

### Assistant:

KEYWORD: Because of
VARIABLE: FAA Data Comm Program
AND: and
CONDITION: using VDL Mode 2 over a congested aeronautical VHF band
EFFECT_1: FAA Data Comm Program will focus on implementing the certain critical air traffic services
CAUSE_1: the limitations
CAUSE_2: constraints of implementing data communications using VDL Mode 2 over a congested aeronautical VHF band


### END
