A couple are never lost for words and bonded over their love of Scrabble - are still playing tournaments together 30 years on. Graham, 62, and Helen Harding, 68, have been married for more than 20 ...
Both of these are present as molecules of two atoms bonded together. The word formulae is the plural of the word formula. If we're talking about more than one formula, we usually say formulae.
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