...However, for real Japanese from the wild there would need to be many many rules, and any slight deviations from the rules would not result in a full parse.

...However, for real Japanese from the wild there would need to be many many rules, and any slight deviations from the rules would not result in a full parse. Much like the rest of biological systems, natural language "laws" and formalisms are more or less guaranteed to have a "except when..." clause after them. I tried to think of a recursive "except when" to the above, but couldn't come up with anything appropriately witty.