Now speed piece the half square units by stacking
the Color 6 and Color 2 3-7/8" x 7-3/4" strips right sides together. Mark
the 3-7/8" square line and mark the diagonals as well, on the back of the top
strip. Sew 1/4" above and below the marked diagonals, pivoting at the square line.
Cut apart on the marked diagonal line, and on the square line. Press seam allowances
towards the darker fabric. This will give you four half square units.
These should measure 3-1/2" ...