Gah. Prefix notation is very easy to parse. Infix notation is a little wonky, but english-speaking people are used to it. Postfix isn’t theoretically any more difficult to parse than prefix, but you have to maintain a memory buffer into which the components are put until the whole structure parses out properly; as the operator comes last, you don’t know what to expect ahead of time.
Unfortunately, Japanese is a postfix system. This is perhaps the single most annoying thing about its grammar. Then again, maybe I just haven’t gotten far enough to learn the truly annoying parts yet.
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