Long half double crochet = Lhdc
This Lhdc is called so because you are doing a hd in
the stitch below the row you would normally do the hdc in. This yarn was kinda
hard to see but when working the moebius headwrap on row 3 you see the top
stitches from the FPDC, you will insert hook in that go completely through both
sides and finish the hdc.
I hope this made some sense.
