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Letter Swap (Posted on 2007-01-19) Difficulty: 2 of 5
The 26 letters of the alphabet were divided into two piles according to a simple rule. Two letters were then swapped leaving the piles as follows.

Pile 1: a,c,e,g,j,o,q,s,u,v,w,y,z
Pile 2: b,d,f,h,i,k,l,m,n,p,r,t,x

Which two letters should be swapped to return each pile to its original composition?

See The Solution Submitted by Vernon Lewis    
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re: With a little help from Small Hint (Possible Spoiler) | Comment 7 of 8 |
(In reply to With a little help from Small Hint (Possible Spoiler) by Syzygy)

But X has at least one straight line (it has 2). A, E, V, W, Y and Z also have at least one straight line each.
  Posted by Charlie on 2007-01-22 14:48:52

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