SORRY, IT DIDN'T PRINT AS I HAD EXPECTED THAT IT WOULD.
Te p/w means a purple and white half-square with the purple on the left and the white on the right. w/p is white on left, purple on right. The gr/bl is gray on left, black on right; bl/gr is black on left, gray on right. This segments the middle square, but makes it interesting. As you can tell, I love making half-aquares.