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fbc7c9027e
because: * list? is O(N), because it needs to test for an improper list. improper lists are lists whose last pair's cdr cell is not '(). null? and pair? are both O(1). * avoids reverse which is also O(N): guile has unlimited stack therefore we can do non-tail-call loop first to pass as parameter to the tail-call loop. this removes the need for prepend-and-reverse.