Mulitple clicks on characters to reveal different layers.

I have the attached slide. One of the edits I got was to see if I can make the learner click on the character to see what the response is. I have managed to do only one click per character, but is there a way to show one layer on the first click, another layer on the second click, and a thrid layer on the third click? 

I assume it is some sort of counting variable, but am not sure how to procede. 

Anyone have any ideas? 

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