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\begin{summarylist}{ll}
\predicatesummary{contains_term}{2}{Succeeds if Sub is contained in Term (=, deterministically).}
\predicatesummary{contains_var}{2}{Succeeds if Sub is contained in Term (==, deterministically).}
\predicatesummary{free_of_term}{2}{Succeeds of Sub does not unify to any subterm of Term.}
\predicatesummary{free_of_var}{2}{Succeeds of Sub is not equal (\Sequal{}) to any subterm of Term.}
\predicatesummary{occurrences_of_term}{3}{Count the number of SubTerms in Term.}
\predicatesummary{occurrences_of_var}{3}{Count the number of SubTerms in Term.}
\predicatesummary{sub_term}{2}{Generates (on backtracking) all subterms of Term.}
\predicatesummary{sub_var}{2}{Generates (on backtracking) all subterms (\Sequal{}) of Term.}
\end{summarylist}

