// This is the output of the ListTry program
l1 = ( a . nil)
l2 = ( b . ( a . nil))
l3 = ( c . ( b . ( a . nil)))
l3 in list notation = ( c, b, a )
l4 = ( b . ( a . z))
l3.tl().eq(l4) results in nil
l1.eq(l1) results in ( nil . nil)
l1.eq(l2) results in nil
reverse l3 = ( a . ( b . ( c . nil)))
reverse l3 as list: ( a, b, c )
l4 is not a list, so l4 as list = error: not a list