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Assembly:
1. Draw
a diagonal line on each of the fabric - A - (light) 2 7/8" squares and layer
each of them right sides together with each of the Fabric - C - (dark) 2 7/8"
squares and sew a scant 1/4" on both sides of the diagonal line.

Cut
apart on the diagonal line and press the seams toward the dark. These
are the 12 half squares lightest/darkest patches
2. Put
these half square units into strips with the fabric - B - 2 1/2" squares like
this:
and then into four patches like this:

Make 6 of the 4 patch units. Note that although all the four patches are
sewn the same, half of them are flipped in the final layout. Be sure to
lay the block out before you sew the units and the patches together.
This will avoid mistakes.
3.
Next make the three "square in a square" patches.
.
Draw a diagonal line on all the Fabric - A - 2 1/2 squares. However this
time, the line is the sewing line. When using this technique sew a
thread toward the outer side of the line. This will allow space
compensation for the thickness of the thread and the fold of the fabric.
See diagram.
Place one fabric - A - square in a corner of the larger 4 1/2" fabric - C -
square, right sides together aligning fabric - A - outer edges with the outer
edges of the fabric - C - square. Sew a thread to the outside edge of
the diagonal line. The outside edge is the side of the line shown by the
arrow. Cut away both the fabric - A - & - C - outer triangles (those
under the arrow) a 1/4 inch from the seam. Then press the remaining
fabric - A - triangle piece over the seam. Repeat this one square at a
time on all four corners of the 4 1/2" fabric - C - squares until there are
three "square in a square" patches.
4.
Carefully lay out the nine patches into the block and sew them together,
first in strips and then as a block.

Note that the four patch units flip from one side of
the block to the other
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