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I'm leaving and I'll come back.
Ittekimasu.
行ってきます。Have a safe trip.
Itterashai.
行ってらっしせい。I'm back/home.
Tadaima.
ただいま。Welcome back/home.
Okaerinasai.
お帰りなさい。Excuse me for disturbing you. (When you visit other's home)
Ojamashimasu.
お邪魔します。I have disturbed you. (When you leave other's home)
Ojamashimashita.
お邪魔しました。──────⊱ ✿ ⊰──────