Each block needs four different DARK 3-1/2" squares, and three
different LIGHT 3-1/2" squares
You also need two different DARK + LIGHT 3-7/8" squares. Stack
these and cut them in half once on the diagonal to make half square
triangles (hst). You only need two dark and 2 light triangles for a
block...
Sew light hst's to a dark hst's, using a 1/4" seam to make
two half squares. Press each to dark side. These should measure3-1/2"
...
Lay out your squares and half squares as shown at left. Sew three
horizontal rows. Join the rows to complete the block! :o)