Question: Combining graphs

Hi

Can anyone tell me how to combine several graphs into one? Fo instance I have one graph with x going from 0-1,another with x going from 1-20 and yet another with x going from 20-21. I can plot them individually but how do I put all three together?

I'm sorry I'm not doing a very good job explaining, but I hope it is understandable.

 

 

 

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