Question: Plot PDE on 2D plane, as times passes

Hello. I have the PDE

u_t + u_xxx = 0

And the function u(x,0) = 2 / cosh2(x)

I want to plot it on the u(x,t) - x axes on 2D plane. And then make more plots as time passes in order to show that u(x,0) disperses. 

Thanks for any help.

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