[Attempto] Use of Prefixes with the Large Lexicon

[Chris Spencer]

I'm using the large lexicon, but I'm noticing that APE still requires
I explicitly tag most nouns and verbs with a prefix.

For example, this fails to understand that "ostrich" is a noun, even
though the lexicon only lists it as a noun.

./ape.exe -text "An ostrich does not fly." -cparaphrase

    <message
	importance="error"
	type="word"
	sentence="1"
	token=""
	value="ostrich"
	repair="Use the prefix n:, v:, a: or p:."/>

And of course this runs fine:

./ape.exe -text "An n:ostrich does not fly." -cparaphrase

  <paraphrase>There is an n:ostrich X1.
It is false that the n:ostrich X1 flies.</paraphrase>

Why is APE requiring I specify a prefix for certain words, even though
they unambiguously exist in the lexicon?

Regards,
Chris