2.6.12 Boolean operations


 		prefix 		 NOT 		 (p: BOOLEAN)   : BOOLEAN 

infix AND (p,q: BOOLEAN) : BOOLEAN
infix OR (p,q: BOOLEAN) : BOOLEAN
NOT p is the complement of p.

p AND q is TRUE if both p and q are TRUE. If p is FALSE, q is not evaluated.

p OR q is TRUE if at least one of p and q is TRUE. If p is TRUE, q is not evaluated.



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