(VAR x y z) (RULES not(not(x)) -> x not(or(x,y)) -> and(not(x),not(y)) not(and(x,y)) -> or(not(x),not(y)) and(x,or(y,z)) -> or(and(x,y),and(x,z)) and(or(y,z),x) -> or(and(x,y),and(x,z)) ) (COMMENT Example 12 in \cite{D33})
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