1 2 3 4
H H H H
* v u X
  * X u
    * v
      *
handedness 1 2 3 R
handedness 1 2 4 R
handedness 1 3 4 L
handedness 2 3 4 R
length 1 H 8 100
length 2 H 8 100
length 3 H 8 100
length 4 H 8 100