* ```
python3 dev/editdist.py -v -s -d 1 -e '@0@' -i speller/editdist.default.txt -a .deps/acceptor.default.hfst \
| hfst-txt2fst  -e '@0@' -o .deps/editdist.default.hfst
Traceback (most recent call last):
  File "dev/editdist.py", line 603, in <module>
    main()
  File "dev/editdist.py", line 557, in main
    ol_alphabet = Alphabet(afile, ol_header.number_of_symbols)
  File "dev/editdist.py", line 134, in __init__
    symbol += byte
TypeError: can only concatenate str (not "bytes") to str