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нечего на зеркало пенять, коли рожа крива stresses
gen.	a bad workman always blames his tools (lulic); It's no good blaming the mirror if your mug is crooked (Kote-F)
proverb	don't lay the blame at someone else's door (don't blame your own faults on others); you must not blame the mirror for showing a crooked face; the looking-glass is not to blame if your own face is plain