Standard Out:

in clause row2col/iooo(cons(X,Xs),cons(cons(X,Ys),Cols),cons(Ys,Cols1),cons(nil,As)) :- row2col/iooo(Xs,Cols,Cols1,As).
  variables have no producer: ["Ys"]

Standard Err:


real	0m0.284s
user	0m0.248s
sys	0m0.016s