ELEMENTS
   E4, 40 - 41 = PU
   R4, 41 - 42 = PR
   L4, 42 - 40 = PL
   E5, 50 - 51 = PU
   R5, 51 - 52 = PR
   L5, 52 - 53 = PL
   EL5,50 - 53 = X53 (IL5*1)
DEFINED PARAMETERS
   PU = 10
   PL = X2 (TIME +5)
   PR = 1
   DPI4 = X1 ((PU - PI4*PR)/PL), PI4 = 0
   DPI5 = X2 ((PU - PI5*PR - PI5*1)/PL), PI5 = 0
