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