In Common Lisp how do I search for a sublist within a list

Question

If I want to find whether (x 2) exists within a list containing ((x 2) (y 2) (z 2)) for example, how do I do this?

(member '(x 2) '((x 2) (y 2) (z 2))) 

returns NIL as does find

Thanks for the help

Answer 1

? (member '(x 2) '((x 2) (y 2) (z 2)) :test 'equal)
((X 2) (Y 2) (Z 2))

In Common Lisp, member uses eql as the default test, which does not work in this case.

See here for details regarding eq, eql, equal and equalp.