Which one do you think is correct and why? We can't just keep giving you the answers, especially when you don't tell us why you're confused about choosing between two options.
So far I haven't been able to think of an example in which "in between" works but "between" doesn't so, to be safe, stick with "between".
You may have to say in between if it ends a sentence: An Oreo has two black wafers with white creme in between.
We normally try to go for the lesser of two evils.
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