Combine these <if> statments?

[Xplorer4x4]

Ok perhaps my other post was to confusing. How might I go about combining these two if statments?

This one inserts ads after the first post.

PHP Code:

<if condition="$post[postcount] % $vboptions[maxposts] == 1 AND $vbulletin->userinfo[usergroupid] != 'x' "> 


This one inserts ads between the last post and second to last post.

PHP Code:

<if condition="$post[postcount] % $vboptions[maxposts] == $vboptions[maxposts] - 1">