def urbanmain() = {

  import M5b._

  import scala.concurrent._

  import scala.concurrent.duration._

  import ExecutionContext.Implicits.global

  import scala.language.postfixOps 

  lazy val f = Future {

    val hw_urban = """+++++[->++++++++++<]>--<+++[->>++++++++++<<]>>++<<----------[+>.>.<+<]"""

    assert(jtable(hw_urban) == Map(69 -> 61, 5 -> 20, 60 -> 70, 27 -> 44, 43 -> 28, 19 -> 6))

    val hw_urban1 = """++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++."""

    assert(jtable(hw_urban1) == Map(14 -> 34, 33 -> 15, 45 -> 44, 48 -> 9, 43 -> 46, 8 -> 49))

    assert(run2("[-]", Map(0 -> 100)) == Map(0 -> 0))

    assert(run2("[->+<]", Map(0 -> 10)) == Map(0 -> 0, 1 -> 10))

    assert(run2("[>>+>>+<<<<-]", Map(0 -> 42)) == Map(0 -> 0, 2 -> 42, 4 -> 42))

    val hw_urban2 = """+++++[->++++++++++<]>--<+++[->>++++++++++

    assert(run2(hw_urban2) == Map(0 -> 0, 1 -> 58, 2 -> 32))

    val hw_urban3 = """++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.

    assert(run2(hw_urban3) == Map(0 -> 0, 5 -> 33, 1 -> 0, 6 -> 10, 2 -> 72, 3 -> 100, 4 -> 87))

  }

  Await.result(f, 32 second)