Attach a large plain square to a pieced unit of the corresponding colour. (press seams towards the plain square)
Join these pieced units in pairs to form the bow tie units
Lay out the bowtie units as shown and join in pairs (
Pic 3a-d)
(Press seams so that they will lie in the opposite direction for a butted seam in the final join)
Pic 3a-d: Constructing the Bowtie Block
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