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незнакомство n stresses
gen.	ignorance (of); nonacquaintance (with); unfamiliarity (Баян); lack of familiarity
Gruzovik	nonacquaintance with; ignorance of
book.	non-acquaintance
math.	nonacquaintance; ignorance
obs.	disacquaintance; inacquaintance; unacquaintance; unacquaintedness