<keyword>include</keyword>
<keyword>include'</keyword>
<keyword>inductive</keyword>
<keyword>include</keyword>
<keyword>include'</keyword>
<keyword>inductive</keyword>
<keyword>constructor</keyword>
<keyword>contradiction</keyword>
<keyword>cut</keyword>
<keyword>decompose</keyword>
<keyword>constructor</keyword>
<keyword>contradiction</keyword>
<keyword>cut</keyword>
<keyword>decompose</keyword>
<keyword>reflexivity</keyword>
<keyword>replace</keyword>
<keyword>rewrite</keyword>
<keyword>reflexivity</keyword>
<keyword>replace</keyword>
<keyword>rewrite</keyword>