* `(list)` `(list1)` `(list 1 2)` `(list 1 2 3)` are the same lists
* `'(1 2 3)` and `(cons 1 '(2 3))` are pairs that are also lists (the same list)
* `(pair? lst)` tests whether `lst` is a pair; if `lst` is a non-empty list, it will also pass this test; if `lst` fails this test, it may be because `lst` is the empty list, or because it's not a list or pair at all
* `(list)` `(list1)` `(list 1 2)` `(list 1 2 3)` are the same lists
* `'(1 2 3)` and `(cons 1 '(2 3))` are pairs that are also lists (the same list)
* `(pair? lst)` tests whether `lst` is a pair; if `lst` is a non-empty list, it will also pass this test; if `lst` fails this test, it may be because `lst` is the empty list, or because it's not a list or pair at all