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Short helpfile for action PIECEWISE
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The following arguments are compulsory: 

                  POINT - This keyword is used to specify the various points in the 
                          function above.. You can use multiple instances of this keyword i.e. 
                          POINT1, POINT2, POINT3... 
                    ARG - the input to this function. You can use multiple instances 
                          of this keyword i.e. ARG1, ARG2, ARG3... 


