Learning to spell was for me, as a dyslexic, a nightmare. I still don't do it well. But the way I'd do it was to spell phonetically. But then, realizing that many words aren't spelled phonetically, I'd add random silent letters.
Thus, a word like 'nothing' could find itself spelled 'knothing' - when I added that silent 'k'
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It used to drive my teachers absolutely up the wall
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ML