proof; evidence; verification / (mathematics) proof

to prove; to confirm / (mathematics) to prove

"natural hair certificate": a certificate requested by some Japanese schools that affirm that a student's hair color is naturally not black, not straight, etc.

(idiomatic) A piece of cake; an extremely simple thing, something trivial, a cinch, easy as pie.

朝飯前: A piece of cake; an extremely simple thing.

(telephony) a common Japanese telephone greeting: hello; used when answering the telephone / used to confirm that the person being addressed is listening, or to confirm if anyone is listening

put away

forget oneself / be beside oneself

Alternative spelling of 開け胡麻 (“open sesame”)

open sesame!