alternate Euler subclass ASK fails: { :i a :B } comes out False, should be True

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What steps will reproduce the problem?
1. Issue the following "FuXi --ns=ex=http://www.agfa.com/w3c/euler/subclass# 
--why="ASK { ex:i a ex:B }" --input-format=n3 --dlp 
http://www.agfa.com/w3c/euler/subclass.n3"

Expected output is True, because subclass.n3 _explicitly_ says ":i a :B".

But the command gives an answer of False.

Fuxi installed from pip on 2014 June 13, following instructions on wiki.

Original issue reported on code.google.com by mearn...@gmail.com on 13 Jun 2014 at 2:22