The thing is, in a scale, you never skip letters. it's always every single one, CDEFGABC. so the formula for minor is WHWWHWW. that means whole step (2 keys up, black or white!) and half step (1 key up, black or white!) so it's whole half whole whole half whole whole. anyway, since you can't skip letters, you cant do, say, G#, cause the one before was G natural. so instead it's A flat. then the next one has to include "B."
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