Usage: barman-generator.py <num_cocktails> <num_ingredients> <num_shots> [<random_seed>]
  num_cocktails (min 1)
  num_ingredients (min 2)
  num_shots (min max[1,num_cocktails+1])
  random_seed (min 1, optional)


IPC'11 OPT
  1-4: 3 3 4
  5-8: 4 3 5
  9-12: 5 3 6
  13-16: 6 3 8
  17-20: 7 3 9


IPC'14 OPT: 
   4 3 5
   5 3 6
   6 3 8
   7 3 9
   8 3 9
   
