startup

while true do
  if redstone.getInput("back") then
    print("Received redstone signal.")
    sleep(1)

    print("Activated portal.")
    redstone.setOutput("top", true)
    sleep(1)
    redstone.setOutput("top", false)
    sleep(5)

    print("Acitvated portal again.")
    redstone.setOutput("top", true)
    sleep(1)
    redstone.setOutput("top", false)
  end

  os.queueEvent("someEvent")
  os.pullEvent()
end