#define vsize 20bss-data: v 80def 0 1 main  vsize iota  show  vsize 1 + loop  show  v @ u.  '\n' emit   0 ;#include "udot.idel"#include "rev.idel"def 0 0 show   0 showing  '\n' emit ;def 1 0 showing   { i --  i vsize - if            v i ref u.  ' ' emit            i 1 + showing          then } ;