def bsd_rand(seed):
   def rand():
      nonlocal seed
      seed = (1103515245*seed + 12345) & 0x7fffffff
      return seed
   return rand

def msvcrt_rand(seed):
   def rand():
      nonlocal seed
      seed = (214013*seed + 2531011) & 0x7fffffff
      return seed >> 16
   return rand