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