Play word くわ入れ くわ入れ くわいれ New Year's ceremony in which a hoe is used to break ground in a field lying in a lucky direction
Play word さ入れ言葉 さ入れ言葉 さいれことば sa-added word (i.e. causative forms with an extra 'sa' like 'ikasaseru' for 'iku')
Play word ずぶ焼き入れ ずぶ焼き入れ ずぶやきいれ immersion quenching (hardening by dropping heated metal into water or oil)
Play word 一芸入試 一芸入試 いちげいにゅうし (system of) admitting students on the basis on their non-academic abilities (e.g. sports, art; as opposed to exam results)
Play word 越境入学 越境入学 えっきょうにゅうがく gaining admission into a school in a school district other than one's own