A.I am altering my course to starboard
B.I am altering my course to port
C.I am operating astern propulsion
D.I am operating ahead propulsion
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A.getting
B.to get
C.to have got
D.for getting
A.at
B.in
C.on
D.over
A.a blast of from five to seven seconds' duration
B.a blast of from five to six seconds' duration
C.a blast of from four to six seconds' duration
D.a blast of from six to seven seconds' duration
A.at
B.for
C.in
D.on
A.on
B.by
C.in
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