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Hi,

To [That's what friends are.], I put my version before you.

[That's what friends are.] ---(my version) That's the thing for which friends exist. or That's the thing in which there are friends.

Could any native speaker right me?

I give thanks to you in addvance.
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That's what friends are. = That is the nature of a friend.

That's what friends are for = That's the thing for which friends exist.
Comments  
Hi,

Bingo!

I've got it.

Thank you to give me to continue to do.