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а ларчик просто открывался stresses
fig.of.sp.	it wasn't hard to figure out (Leonid Dzhepko); the answer to the puzzle was quite simple (after all Leonid Dzhepko); the explanation was quite simple (Leonid Dzhepko); the reason was all too obvious (Leonid Dzhepko)
humor.	that accounts for the milk in the coconut (VLZ_58)
idiom.	the solution was as plain as day (VLZ_58); it was as obvious as the nose on one's face (VLZ_58); that was a box that opened of itself (Taras); the mystery is easily solved (Taras); the solution is quite simple (Taras); what can be simpler? (Taras); there was nothing to it (Taras); the reason is clear as day (Taras); the mystery was easily solved (Taras); what could be simpler? (Taras)
quot.aph.	the chest was open at that minute (archive.org Talmid)
а ларчик просто открывался!
slang	buy the gnome (ycombinator.com SirReal)
а ларчик просто открывается
inf.	the explanation was quite simple