(VAR x y z) (RULES not(and(x,y)) -> or(not(x),not(y)) not(or(x,y)) -> and(not(x),not(y)) and(x,or(y,z)) -> or(and(x,y),and(x,z)) ) (COMMENT Example 4.22 (Disjunctive Normal Form) in \cite{SK90})
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