It seems I'm having trouble understanding what you're asking.
"all the cominations for the same potion" [emphasis added] counts as one potion, regardless of which order you collect/use the herbs. For example Rose, Rose, Lotus is the same potion as Rose, Lotus, Rose and will count only as one potion toward the required 50.
Different potions each count as a potion, as long as the herbs that you use are different from other potions that you've made. For example, Rose, Rose, Lotus is a different potion from Rose, Lotus, Lotus.
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