Monoid

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a monad is a monoid in the category of endofunctors .
a woman in a white dress and purple tights is standing in a street
a woman in a blue cape is holding a blue object
a screen shot of a video game with chinese text
a black and white photo of a man with a beard and long hair
a book is open to a page that says ' i 'm a wizard ' on it
a man with gray hair and a white beard looks at the camera with his eyes closed
a woman in a blue dress is dancing in front of a blue light