1 2 3 4
E E E E
* - X t
  * v c
    * v
      *
handedness 1 2 3 R
handedness 1 3 4 L
handedness 2 3 4 L
sheetS 1 4 2
sheetD 3 1
length 1 E 5 100
length 2 E 5 100
length 3 E 5 100
length 4 E 5 100