Why #define TRUE (1==1) in a C boolean macro instead of simply as 1?

I've seen definitions in C #define TRUE (1==1) #define FALSE (!TRUE) Is this necessary? What's the benefit over simply defining TRUE as 1, and FALSE as 0?
And more: #define TRUE (’/’/’/’); #define FALSE (’-’-’-’) (taken from coding-guidelines.com/cbook/cbook1_1.pdf page 871)

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