13 creatures of size 10:
  0a+1a+2b+5b+4a+3a+3c+5a+4b
  0a+1a+2c+4c+3b+5c+4a+2c+4c
  0a+1a+2c+4b+5a+2b+4c+5b+2c
  0a+1b+2b+5c+2b+5c+4a+2c+5b
  0a+1a+2b2b+4a+3c+5b+3a+5b
  0a+1a+2a+2a+5c+3b+5a+3c-----3c
  0a+1a+2c+4c+3b+5a+3c+5b-----3c
  0a+3c+5a+4b+2a+5c+3c+3b+5c
  0a+3c+5a+3c+3a+5c+3c+3b2b
  0a+3a+3c+5a+4b+2a+5c+2a+4b
  0a+1a+2a+2b+3a+5c+3b+5a-----3c
  0a+2b+4c+5b+3a+4b+2a+5c+3b
  0a+3c+5b+3b+3a+5c+3c+3b2a