// Bubble sort

// Rules
bsort(ret) >< [] => ret~[];
bsort(ret) >< x:xs => bsort(ret)~cnt, bubble(cnt, x)~xs;
bsort(ret) >< M(x) => ret~x;

bubble(ret, int x) >< [] => ret~M([x]);
bubble(ret, int x) >< M(w) => ret~M(x:w);
bubble(ret, int x) >< (int y):ys
| x<y => ret~(x:cnt), bubble(cnt, y)~ys
| _   => ret~(y:cnt), bubble(cnt, x)~ys;


// Nets
bsort(r)~[3,6,1,9,2];
r;