import Data.List
import System.Random
import Data.Ord

type Point     = (Float,Float)
type Color     = (Int,Int,Int)
type Polygon   = [Point]
type Person    = [Int]
type Link      = [Point]
type Placement = [(Point,Person)]

type EnergyFunction a              = a -> Int
type TemperatureFunction           = Int -> Int -> Float
type TransitionProbabilityFunction = Int -> Int -> Float -> Float
type MotionFunction a              = StdGen -> a -> (StdGen,a)

main = do 
  putStr "Hello World! \n"

Hello World!