tests[][] = [ [ -2 2 1 ] [ 2 2 0 ] [ -2 2 -1 ] [ -2 2 10 ] [ 2 -2 1 ] [ 2 2 1 ] [ 2 2 -1 ] [ 2 2 0 ] [ 0 0 0 ] ]
for i to len tests[][]
   write tests[i][] & ":  "
   start = tests[i][1]
   stop = tests[i][2]
   inc = tests[i][3]
   if inc = 0
      print "infinite loop"
   else
      for j = start step inc to stop
         write j & " "
      .
      print ""
   .
.