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