-x'' -> INTEGRATOR.1 -> -x'
--x', IC:-x0 -> INTEGRATOR.2 -> x
-y'' -> INTEGRATOR.3 -> -y'
--y', IC:-y0 -> INTEGRATOR.4 -> y
-x,y -> MULTIPLIER.1 -> x*y
-y,y -> MULTIPLIER.2 -> y^2
+x'' -> INTEGRATOR -> -x'
+-x', IC:-x0 -> INTEGRATOR -> x
+y'' -> INTEGRATOR -> -y'
+-y', IC:-y0 -> INTEGRATOR -> y
+x,y -> MULTIPLIER -> x*y
+y,y -> MULTIPLIER -> y^2