My two cents would be that this system did not originate with LHC, and other hair care sites use the same classification system.
Whether or not we care if our information is cross compatible with other sites might be the real question.
I would imagine it would be just as clear to state that you fall to one end or the other of each category, which would give you the same number of categories, like this:
i
i/ii
ii
ii/iii
iii
And would still be somewhat understandable to other people who use the original system.
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