The third strip needs to be 3-inches wide and at least 13.5-inches long. Once again you will need two, one for each side.
The forth strip needs to be 2-inches wide and at least 9.5-inches long. Two will be needed.
The fifth and final strip needs to be 2-inches wide and at least 5-inches long. Two will be needed.
Once the strips are cut locate the center of each one before sewing the strips together.
The seam allowance needed is 1/4-inch.
All seams need to be pressed away from the center block.
When the block has been stitched and pressed place on a cutting board;
It measures 12.5-inches square.