def urbanmain() = {

  import M5b._

  //println(combine(optimise(load_bff("benchmark.bf"))).length)
  //println(combine(optimise(load_bff("mandelbrot.bf"))).length)

  assert(combine(optimise(load_bff("benchmark.bf"))).length == 134)
  assert(combine(optimise(load_bff("mandelbrot.bf"))).length == 6509)
}