new_contents: import sys
  import subprocess
  import shlex
  
  font = sys.argv[0]
  pointsize = 72
  
  char = {
      'a': 'a_small'
  }
  
  
  
  for letter, file in char:
      cmd = '-font {:s} -pointsize {:d} label:{:s} {:s}.jpg'.format(
          font,
          pointsize,
          letter,
          file
      )
      cmd = shlex.split(cmd)
      subprocess.call(cmd)
  
subject: add gen_dataset.py