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first officer
avia., Canada	A licensed pilot assigned to duty as a pilot in an aircraft during flight time, other than as a a pilot-in-command; or b a pilot receiving flying instruction
First Officer also called a co-pilot
abbr., avia.	FO (второй пилот Val_Ships)

first: 4 phrases in 3 subjects

Abbreviation	1
NASDAQ	2
Trademark	1