Text Comparison (GNU Emacs Lisp Reference Manual)| www.gnu.org
Sets And Lists (GNU Emacs Lisp Reference Manual)| www.gnu.org
Regexp Search (GNU Emacs Lisp Reference Manual)| www.gnu.org
Lists (GNU Emacs Lisp Reference Manual)| www.gnu.org
Equality Predicates (GNU Emacs Lisp Reference Manual)| www.gnu.org