Before starting the training, we had to make several decisions regarding the codec, i.e. the set of characters known to the final model. We kept the long s, resolved all ligatures with the exception of ß (sz), regularized Umlauts like aͤ, oͤ, uͤ, quotation marks, different length hyphens, the r rotunda (ꝛ) and mapped the capital letters I and J to J. Applying these rules resulted in a codec consisting of 93 characters: