List predicates (continued)

> (listp ’(a b c))

T

> (listp ’x)

NIL

> (consp ’()) ; NIL is not a cons.

NIL

> (listp ’()) ; NIL is a list.

T

> (consp ’(a . b))

T

> (listp ’(a . b)) ;note listp’s limitation.

T

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