### Instruction:

Extract the cause and effect entities from the following sentence:
Because of spectrum constraints in the aeronautical L-band, L–DACS should be built as a broadband system, potentially accommodating a wide array of applications and services that would otherwise be difficult, inefficient, or even impossible to implement

### Assistant:

KEYWORD: Because of
VARIABLE: L–DACS
CONDITION: should be built as a broadband system
NOT_RELEVANT: potentially accommodating a wide array of applications and services that would otherwise be difficult, inefficient, or even impossible to implement
EFFECT_1: L–DACS should be built as a broadband system
CAUSE_1: spectrum constraints in the aeronautical L-band

