I got it! I was just fiddling around, so I'm not positive, but I think the "L" can go both ways. Try it and see if that helps. You may even use both directions in the last one. HTH If you don't get it let me know and I'll PM what I'm pretty sure I did.
Ok - still working on this. I left the 1st and 4th columns alone since there needs to be all white beads (1st) and the black white black (4th). Do all the beads on the third row need to be used up for the solution? Or is there one bead "left over"?