- filename_template[0] = letters[v % num_letters]; v /= num_letters;
- filename_template[1] = letters[v % num_letters]; v /= num_letters;
- filename_template[2] = letters[v % num_letters]; v /= num_letters;
- filename_template[3] = letters[v % num_letters]; v /= num_letters;
- filename_template[4] = letters[v % num_letters]; v /= num_letters;
- filename_template[5] = letters[v % num_letters]; v /= num_letters;