roll

<< f(n-1) ... f(0) n j roll f(j-1 mod n) f(j-2 mod n) ... f(j-n mod n) >>
integer n, j;
Example: [(a) (b) (c) 3 1 roll] ::  ==>[(c) (a) (b)]



Nobuki Takayama 2020-11-24