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<p><math>\operatorname{Ex}</math> maps every tree on the left side of <math>S\!</math> to the right side of <math>O.\!</math></p>
 
<p><math>\operatorname{Ex}</math> maps every tree on the left side of <math>S\!</math> to the right side of <math>O.\!</math></p>
   −
<p><math>\operatorname{Ex}</math> every tree on the right side of <math>S\!</math> to the left side of <math>O.\!</math></p>
+
<p><math>\operatorname{Ex}</math> maps every tree on the right side of <math>S\!</math> to the left side of <math>O.\!</math></p>
 
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