Let us know in case you change your mind.
Explanation:
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However: This word is used to introduce a contrast or contradiction. It doesn't fit the context of the sentence where the speaker is expressing a condition for communication.
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Although: This word is used to introduce a contrast or concession, but it doesn't fit the context of indicating a condition for notifying someone.
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Suppose: This word means to assume or guess. It doesn't fit the context of the sentence, which is about informing someone in a certain situation.
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In case: This is the correct choice. "In case" is used to indicate that the action of letting the speaker know is dependent on the condition of the other person changing their mind. It fits the context of the sentence that is discussing a condition that prompts a certain action.
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