Made for the work that they must do what wa khla and ngatham to be Ko in any direction it is a summary, so educate the employee before doing the next stage.
So that the employees do Clark's work that will be done and will do to the neck in any direction and also a summary to educate the backboard before proceeding to the next stage.
For employees to work คล้าว on what to do and will need to do in the direction of problems also is a summary to educate employees before practice in next .