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atula kapoor ipa american english pronunciation diphthongs recognized by ipa simeon potter鈥檚 ninth diphthong atula ahuja british english phonology history of english language vowels causes of gvs great vowel shift gvs a mysterious linguistic phenomenon short vowel shift long vowel shift diphthongs shift coding sheet. the t-test statistical test and chi-square anova analyse data learn portugese learn french learn english. learn german learn spanish learn new language duolingo learn italian translating the web