Help needed with row setup.

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What I am trying to do is set up a row that handles posts, at the moment it is fine if there are only 2 posts, however, as soon as more are added then there is one post at the top, then a row with 2, then a 3rd row with just one post also.

I want the code to make a new row once two posts have been put in to a row, then carry on in this manner while there are still posts.

Thanks for any help!