3sq-column

https://gyazo.com/faada29c2042586085e296409943382c

unit cell (Z+4L & Z/90deg)

Unit size: 3L * 3L * 4L

RR * 8 + RH * 8 + RS * 4

Fill rate: 20 / 36 = 56%

https://gyazo.com/5b53fcfdb5a9ce2f446a36ffd705e118

2 unit cells (Z+8L)