`(c-du N) → list or '#f`syntax`(c-du N '(SUB1 ...)) → list or '#f`syntaxConvert from decimal integers to unary integers. If N is in the domain of

`SUB1`, yields a list of that many elements, specifically the integers`(N-1, ..., 0)`. Otherwise, yields`'#f`.`SUB1`is any operation that given N yields N-1, where 1 <= N. Defaults to`c-dsub1`, which supports 1 <= N <= 16. See the note for`c-dsub1`for how to make an operation with a larger domain.(ck () (c-quote (c-du '0))) ;; ==> '() (ck () (c-quote (c-du '16))) ;; ==> '(15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0) (ck () (c-quote (c-du '17))) ;; ==> '#f