The root is obtained by the following way: If, after the removal of -r or -er of the infinitive, the root ends in a vowel, the final -t is added or the final y is changed into t: crea/r, crea/t-, crea/t/or; atiny/er, atin/t, atin/t/ion If the root ends in consonants d, r or g, they are changed into s: decid/er, deci/s-, deci/s/ion; adh/er, adhe/s, adhe/sion, immerg/er, immer/s, immersion In all other cases, with six exceptions, the removal of the ending gives the exact root: duct/er, duct-, duct/ion.
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