YOU SAID:

hi me he we key 900 one is cool 21

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こんにちは私は彼が鍵を握っている

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Hello I am holding him the key

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こんにちは私は彼に鍵を握っている

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Hello I have the key to him

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こんにちは私は彼に鍵を持っています

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Hello I have a key to him

INTO JAPANESE

こんにちは私は彼に鍵があります

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Hello I have a key to him