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как знать! stresses
gen.	wer weiß!; man kann nie wissen!
как знать
idiom.	da steckt ja keiner drin! (Queerguy)
inf.	man weiß nie (Andrey Truhachev)
как знаешь
inf.	es liegt ganz an dir (Andrey Truhachev)

как знать: 48 phrases in 5 subjects

Avuncular	3
Education	1
General	33
Idiomatic	4
Informal	7