Open Weave Heart 1 originally had the U3 at the center of R4 as optional. When I wove the sample below I left that U3 out. I put it in on Open Weave Heart 2 and decided I liked it best that way. The center U3 of R4 is no longer optional, but it is missing from the pink sample below.
OPEN WEAVE HEART 1
Open Weave Heart 1, front
Open Weave Heart 1, back
Open Weave Heart 1
***************************
OPEN WEAVE HEART 2
Open Weave Heart 2, front
Open Weave Heart 2, back
Open Weave Heart 2