Rollovers or displaying text on click

I have a series of bullets and subpoints that I need to display on a single slide but it is a lot of text.I would like to make it so that the major bullet point are displayed when the slide loads and when each bullet point is clicked, the subpoints show up and then go away.I am sure there's a simple way to do this but I ahev yet to figure it out.Any help?Example: MAIN BULLET1--Subpoint1--Subpoint2--Subpoint3MAIN BULLET2--Subpoint1--Subpoint2MAIN BULLET3--Subpoint1--Subpoint2--Subpoint3--Subpoint4Thank you.

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