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back [bæk] abbr.
abbr.	backwardation
abbr., mining.	bck
abbr., polym.	bk
abbr., textile	depth
BACK [bæk] abbr.
abbr., automat.	backward
back. abbr.
abbr., econ.	backwardation
mil., WMD	backup

Back: 2 phrases in 2 subjects

Optics branch of physics	1
Telecommunications	1