You will need editing software such as Photoshop.
I recommend using Epson Premium Presentation Paper Matte Double-Sided (8.5x11" sheets)
Total of 8 images (L 2.5"x W 2") 4 on each side.
First you copy (copy & paste in PS) on 1 page - four 2" x 10" stripes. Then you repeat with 4 new images on a separate PS file.
Once it's printed you can cut them into 4 stripes.
It's a little tricky at first because you have to figure out which way to face the paper when you print the back so do a test print first. I deckled one end of the paper.