How to interpret
 
•cf. Hutchinson 2005 p.142. fig.220
•cf. Szentpαl s.a. p.95 fig.109a-b
•the movement type and
• the change in the support
•the rotation  of the legs
•the direction and
• its reference point
•the distance and
• its calculation mode:
•3 units gap between the feet
•6 units from heel to heel