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I saw this word ‘spelt’ in a piece of writing from another teacher a while ago and seemed to be strangely shocked, that someone who was a native speaker, who was a competent teacher had made this kind of (what I considered then) mistake.
After looking into this, I found that in fact these two spellings can be interchanged. My question was, is one an American version or is it ‘spelled’ differently for another reason.
You can already see which way I am leaning.
What’s your opinion?