Most words of Hebrew origin use the Hebrew plural suffixes, either "-im" (e.g., ספֿר "seyfer" 'holy book', cf. ספֿרים "sforim" 'holy books') or "-es" from Hebrew ות- "-ot" (e.g., סוד "sod" 'secret', cf. סודות "soydes" 'secrets'). As these examples show, many plurals of Hebrew origin involve stem mutation in addition to the suffix, paralleling the original Hebrew. Not all words of Hebrew origin form their plurals in the same way they do in Hebrew: e.g., קול "kol" 'voice' has the plural קולער "keler", formed with the Germanic-origin "-er" suffix and umlaut; and טלית "tales" 'tallit' uses the "-ot" plural in Hebrew but the "-im" plural in Yiddish טליתים "taleysim".