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as if nothing had happened stresses
gen.	как ни в чём не бывало
Gruzovik, inf.	как ни в чём не бывало
Makarov.	как будто ничего не случилось
carry on as if nothing had happened
inf.	ноль реакции (as in "я рукой бью – судья ноль реакции" I beat it away with the hand but the referee carried on as if nothing had happened denghu)

as if nothing had happened: 4 phrases in 2 subjects

General	3
Makarov	1