* What vowels are similar and what vowels are different, and ** historical events such as the Great Vowel Shift affected *** A word frequency list was drawn up from the corpus, and spelling errors based on vowels were collected by hand. Single occurrences were omitted from the study, as were obvious typing errors (such as "mbile" for "mobile") even if they occurred more than once. There were a total of 5207 tokens of 1209 mispellings types.
