NEEDS: some smart fitness function to present the performance

Crossover:

      1 2 2 4 4 | 1 3 5 5 3 
      2 3 1 2 3 | 1 5 5 4 4
      
      1 2 2 4 4   1 5 5 4 4
      2 3 1 2 3   1 3 5 5 3
      -----------------------normalize to play by the rules
      1 2 2 4 x   1 5 5 4 x   <- x chosen by random
      2 x 1 2 x   1 3 5 5 3
      ----------------------
      1 2 2 4 3   1 5 5 4 3
      2 4 1 2 4   1 3 5 5 3