にんしき
recognition, acknowledgment
You take the thing in and can tell it from the next one, which is what understanding comes down to. The same ninja にん as 確認, and this time he knows しき which door it was: にんしき.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.