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 | |
| ó Ó | ca Catalan, cs Czech, cy Welsh, es Spanish, fo Faroese, ga Irish, gl Galician, hu Hungarian, is Icelandic, it Italian, nl Dutch, no Norwegian, pl Polish, pt Portuguese, sk Slovak, wen Sorbian | |
| ò Ò | ca Catalan, cy Welsh, gd Scottish Gaelic, it Italian, mt Maltese, nl Dutch, no Norwegian | |
| ô Ô | br Breton, cy Welsh, fr French, nl Dutch, no Norwegian, pt Portuguese, sk Slovak, sq Albanian | |
| ö Ö | cy Welsh, de German, et Estonian, fi Finnish, hu Hungarian, is Icelandic, nl Dutch, sv Swedish, tr Turkish | |
| ō Ō | lv Latvian | |
| õ Õ | et Estonian, pt Portuguese | |
| ő Ő | hu Hungarian | |
| ø Ø | da Danish, fo Faroese, kl Greenlandic, no Norwegian | |
| œ Œ | fr French | |