BONUS CONTENT Extended characters used in major European languages grouped by language and by the Latin letter they are based on. This content is associated with Chapter 3 of the book.
| Character | Languages | |
| ú Ú | ca Catalan, cs Czech, cy Welsh, es Spanish, fo Faroese, ga Irish, gl Galician, hu Hungarian, is Icelandic, nl Dutch, no Norwegian, pt Portuguese, sk Slovak | |
| ù Ù | br Breton, cy Welsh, fr French, gd Scottish Gaelic, it Italian, mt Maltese, nl Dutch, no Norwegian | |
| û Û | br Breton, cy Welsh, fr French, nl Dutch, no Norwegian, sq Albanian, tr Turkish | |
| ü Ü | br Breton, ca Catalan, cy Welsh, de German, es Spanish, et Estonian, eu Basque, fr French, gl Galician, hu Hungarian, nl Dutch, no Norwegian, sv Swedish, tr Turkish | |
| ŭ Ŭ | eo Esperanto | |
| ū Ū | lt Lithuanian, lv Latvian | |
| ů Ů | cs Czech | |
| ų Ų | lt Lithuanian | |
| ű Ű | hu Hungarian | |