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A monad is just a monoid in the category of endofunctors, what's the problem?

Monoid postcards for sharing love and wisdom, or decorating your wall with memories.

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Postcards

Monoid Postcards for Sale

High quality Monoid inspired Postcards by independent artists and designers from around the world.  Unique artwork for posting words of wisdom or decorating your wall, fridge or office. All orders are custom made and most ship worldwide within 24 hours.

Monoid Postcards

Monoid Postcards

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