A.space
B.distance
C.visibility
D.access
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A.CPP
B.FPP
C.PSC
D.FSC
A.which
B.when
C.whose
D.what
A.ahead or astern
B.fore or aft
C.up or down
D.speed or direction
A.manual mode
B.automatic mode
C.remote mode
D.follow-up mode
A.in addition to
B.in addition that
C.except that
D.except when
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