abcdefg......

letter B.....
left section.... half square triangle, 1&1/2" x 3&1/2" muslin, half square triangle.....
center section....1&1/2" x 2&1/2" muslin and half square triangle
                             1&1/2" x 2&1/2" red and 1&1/2" sq. muslin
                              1&1/2" x 3&1/2" muslin, then same red and repeat muslin.....
right section.....1&1/2" x 2&1/2" red, same size muslin and half sq. triangle.....
frame block......