Question: How to display in order?

I have three cylinders as follows.

with(plots);
with(plottools);
p1 := cylinder([1, 1, 1], 1, 1);
p2 := cylinder([1, 1, 1], 2, 3);
p3 := cylinder([1, 1, 1], 1, 4);

I want to display in order where p1 is at the bottom, then p2, and then p3 on the top of p2. Thank you for your assistance.

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