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    #####
    sub mult {

...
        return @c;
        }
    ####

   ####
   for $i (0..$N){
       @results  = mult($a,@b[$i]);
       }
   ####

   ####
   for $i (0..$N){
       @results[$i][]  = mult($a,@b[$i]);
       }
   ####