Maybe you were looking for one of these abbreviations: RCMX-RCN-RCNC-RCNN-RCNO-RCO-AK-RCO-NE-RCoA-RCOCI-RCOE.
Measure the width of your quilt and add 4-6 (or chosen excess). Design a backing to equal that width, adding 1/2 to each panel for each seam you'll use to sew it to a neighboring panel. Cut panels to the length of your quilt plus 4-6 (or chosen excess). Sew panels together with a 1/2 seam allowance. Press seams open to reduce bulk. Press backing before use.
1. Your quilt back should be a MINIMUM of 3-4 bigger than your quilt top on each side. That means a total of 6-8 longer and 6-8 wider. Ask your quilter -- she might want more. That is because your quilter will use that fabric to attach the quilt to the bars and side clamps of their frame.