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Mostly it's only americans who use "spelled", everyone else uses "spelt"
https://www.grammarly.com/blog/spelled-spelt/

Both are correct.

spelled
https://en.m.wikipedia.org/wiki/Muphry%27s_law

I see spelt fairly often. Spelled is mostly American.

I was referring to fipple's correction with "Spelled" instead of "spelled". If he's going to be pedantic, he's got to go all the way.