The eight digraphs are 'ch', 'dd', 'ff', 'ng', 'll', 'ph', 'rh' and 'th'.
Five letters that are included in the English alphabet are missing from the Welsh: 'K', 'Q', 'V', 'X' and 'Z'.
26 + 8 – 5 = 29.
© Haydn Thompson 2022