On Mar 9, 2007, at 8:16 AM, Robert Dober wrote:

> On 3/9/07, James Edward Gray II <james / grayproductions.net> wrote:
>> On Mar 9, 2007, at 8:04 AM, Jason Roelofs wrote:
>>
>> > Quick clarification, I would assume you mean "turn 90 degrees", not
>> > 90%, as
>> > that doesn't make any sense.
>>
>> Ick, yes.  Good catch.  I'll fix it on the web site...
>>
>> James Edward Gray II
>>
>>
> Maybe you would like to clarify what the center is too (I'll just use
> the left hand upper corner of the center but maybe).

That's what my diagrams are for, I hope.  ;)

To eliminate the idea of rotation, we could just say this:  given the  
neighborhood:

+--+
|12|
|43|
+--+

Change to:

+--+
|23|
|14|
+--+

or:

+--+
|41|
|32|
+--+

There's a 50% chance to go either way.

James Edward Gray II