Double; The last syllable is an accented closed syl. with 1 v. & 1 c. & you are adding a vowel suffix: propel' + er, defer' + ing, submit' + ing, control' + er, transmit' + er, occur' + ance, permit' + ed, Don't Double: e'vent + ful, defer' + ment, al'ter + ed, en'ter + ing, relent' + less, of'fer + ing, suf'fer +ed,

2-1-1 Doubling Rule, Level V SIS

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