I'm doing a mail merge for a postcard. I plan on fitting four postcards per 8.5" x 11" sheet of paper. Since both sides of the postcard have merge fields I have to do the print job in a specific page print order, and this is what I need help with.

A picture's worth a thousand words so here is how the print order needs to be.

Front Side:
https://i.imgsafe.org/b3becb012b.jpg

Back Side:
https://i.imgsafe.org/b3beaefc16.jpg

Notice that when I cut the paper into four postcards postcard one will consist of page 1 and 2, postcard 2 will consist of page 3 and 4, postcard 3 will consist of page 5 and 6, and postcard 4 will consist of page 7 and 8.