@mangosiri it does mean that there can only be 1 string for the butterflies, but the colored string acts like a straight edge. The rest of the string is white, each segment has a starting and finishing triangle end. When you end the triangle ends of a segment, make the butterfly how you would for a normal version of this pattern. Then start a new triangle end. Always make the colored string the “edge” string (like the edge string of a bracelet with the straight edge technique.