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's house; 's home
今日きょうはともだちんちへ。
I'm going to my friend's house today.
あの子こんちの犬いぬはかわいいね。
That kid's dog is cute, isn't it?
先生せんせいんちでご飯ごはんをごちそうになったことがある。
I've been treated to a meal at the teacher's house.