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ab-cd+* abcd-*+ ab-*cd+ ab-c+d*
abcd - * + ab - cd * + ab - c * d + abc - d * +
abcd*-+ ab*c-d+ ab-cd+* abc-*d+
ab-c*d+ abc+d*- abcd-+* abc+-*d
(a+b)*(c-d) a+b*c-d a+b*(c-d) (a+b)*c-d
abcbx0>∨∧∧∨ ab∧c∨b∧x0>∨ ab∧cb∧x>0∨∨ ab∧cbx0>∨∧∨
a+b/c+d (a+/(c+ a+b/(c+ a+b+c/d
cd+ab-* ab*c-d+ abcd+-* abcd*-+
abcd*-+ ab*c-d+ ab-cd+* abc-*d+
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ab+cd-* abcd+-* ab+*cd- abcd*+-
a-b+c*d (a-*c+d (a-*(c+ a-b*c+d
(a+b)*(c—d) a+b*c-d a+b*(c—d) (a+b)*c—d
abcbx0>∨∧∧∨ ab∧c∨b∧x0>V ab∧cb∧x>0∨∨ ab∧cbx0>∨∧∨
a+ b/c+ d (s+b)/(e+d) a+ b/ (c+d) a +b+ c/d
abcbx0>∨∧∧∨ ab∧c∨b∧x0>∨ ab∧cb∧x>0∨∨ ab∧cbx0>∨∧∨
abcbx0>∨∧∧∨ ab∧c∨b∧x0>∨ ab∧cb∧x>0∨∨ ab∧cbx0>∨∧∨