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