Lesson 11 in the Master Weaver series 'Problems in Teaching' explains how to use profile drafts to find all the symmetrical variations of a block pattern instead of working on a full draw-down. It uses a two-block Bronson lace threading as the worked example, deriving variations A through H by replacing blocks with tabby, reversing blocks, or combining both blocks. A table gives treadling directions and pick counts for each variation, and the lesson ends by pointing to the next lesson, which covers three-block patterns.