Duplicity in RHS_Struct

[GemmaMasFes6]

Hi!

I am using the SINDy-PI with the example of SinglePendulumOnChart and, when I change the LibPoly and GuessPoly from its initial definition to LibPoly=[2;1;0;0]; and GuessPoly=[2;1;0;0]; I observe that the RHS_Struct has repeated terms, i.e., all the combinations between the states appear twice. I don't know if it is a bug or if it is necessary in order to discover the model.