Divide sequence elements into pairs
<p>I have a sequence of 16 elements: 1,2,3,..., 16 ( or 2*n elements). Sequence elements always goes from 1 to length(sequence) that is sequence of 4 elements is 1,2,3,4.</p>

<p><strong>Edit</strong>: first sequence element is always = 1, second sequence element = 2, third sequence element = 3 and so on. <strong>It's for a game "find a pair pictures"</strong>.</p>

<p>I want to write an algorithm which divide elements into pairs. For Example,
1-15
2-16
3-13
4-9
5-14
6-10
7-11
8-12</p>

<p>PS: no linq please :) vs2005</p>

<p><strong>Edit</strong>: As I can see, my question is so simple so no one can answer it :) Or everybody afraid something ?</p>
