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RE: Question for Brian McGahan and others posted 12/22/2005
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128 	64 	32 	16 	8 	4 	2 	1

0	0	0	0	0	0	0	0
0	0	0	0	0	1	0	0
0	0	1	0	0	0	0	0
0	0	1	0	0	1	0	0
___________________________________________
0	0	1	0	0	1	0	0 = 36

All vertical bits are checked XOR and if they are:
	(0+0)=0	
	(0+1)=1
	(1+1)=0
	(1+0)=1


-----Original Message-----
From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On Behalf Of
nenad pudar
Sent: Wednesday, December 21, 2005 7:57 PM
To: bmcgahan@xxxxxxxxxxxxxxxxxxxxxx; ccielab@xxxxxxxxxxxxxx
Subject: Question for Brian McGahan and others

Hi Brian
I have the question regarding your paper on Computing Access-List and
Wildcard Pairs

There you have

00000000
00000100
00100000
00100100
_________
XOR
00100100=36****

I cannot get this trying in any way (for third column)

1) (((0 XOR 0) XOR 1) XOR 1)= ((0 XOR 1) XOR 1)= 1 XOR 1 =0

2) (0 XOR 0) XOR (1 XOR 1) = 0 XOR 0 = 0

I am doing something wrong or there is some other trick here ?


thanks
nenad

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