Hello (should this be posted on the newusers group?),
I'm constructing a tunnel out of many small blocks - fairly simple stuff. However, I'd
like to cut a hole in it, for a doorway. Since I'm using while loops, I don't see any
way 
to remove certain blocks, and #difference is *really* slow. Any suggestions on this?
By the way, deleting whole blocks to make the hole is perfectly fine.

Thanks!
Jkior



The image thus far:
<a
href="http://www.spacetowns.com/jkior/tunnel.jpg">http://www.spacetowns.com/jkior/tunnel.jpg</a>

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