I have one you have one if you remove the first letter

I have one you have one if you remove the first letter

I have one you have one if you remove the first letter

Can you solve this?

i have one you have one

I have one, you have one. If you remove the first letter, a bit remains.

If you remove the second, bit still remains.

If you remove the third, it still remains.

What is it?

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ANSWER

A habit.