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Does the word "supplementary" have an adverbial form?

My first instinct is the word "supplementarily," but as far as I can tell that isn't a word.

closed as off-topic by Edwin Ashworth, Drew, Misti, tchrist, Dan Bron Feb 24 '15 at 15:10

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From Collins Dictionary:

"Supplementally" is the common adverbial form, while "supplementarily" is accepted as a rare form.

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