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Or at least that’s what I think…
I’ll tell you about it tomorrow.
Essentially what I’m going to argue is that once you stop considering い and な adjectives to be real adjectives (because they aren’t), then you find that there are relatively rare instances where a substantive (essentially a noun) will precede another noun.
This is the case in little phrases such as 二三日, where the noun is 日 and then 二三 is in the attributive position but clearly isn’t part of an IP.
Nobody quote me on this discovery yet; because I need to look at some more data and make hypotheses and see if they stack up fairly well first.