Question: Combining Plots

Let say, I have two plots

P1:= plot(........):
P2:= plot(........):

We can display in one plot as



My question is, is there any way to combine these two plots into one and then display.

For example:  

P:= combine(P1, P2);



The reason for asking this question:

I am plotting multiple curves in a loop depending on some conditions but I can't display them in one plot. They are all appearing on different plots.



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