Miscellany

(define (delq item lis)
  (let ((l))
    (if (null? lis)
      (set! l '())
      (begin
        (set! l (car lis))
        (set! lis (cdr lis))
        (while (not (null? lis))
          (if (not (= item (car lis)))
            (set! l (append l (list (car lis))))
          )
          (set! lis (cdr lis))
        )
      )
    )

    l
  )
)