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## Homework Statement

GIve a formal proof or derivation of:

(a iff (b iff c)) iff ((a iff b) iff c))

## The Attempt at a Solution

I've tried it for a long time. Idea is to assume (a iff (b iff c)) then get ((a iff b) iff c)) and then vice versa. BUt no matter how I try, I always get some if conditions istead of the iff.

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