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на счастье stresses
gen.	zum Glück (Andrey Truhachev); glücklicherweise (Andrey Truhachev); erfreulicherweise (Andrey Truhachev)
Russian thesaurus
на счастье
gen.	к счастью (Andrey Truhachev); по счастью (Andrey Truhachev)

на счастье: 19 phrases in 4 subjects

General	11
Idiomatic	4
Informal	2
Proverb	2