Discrete Time Convolution

I have to graphically show a DT convolution. I need to graph both inputs and then the output. The problem I am having is using stem. I need my first function x[n] to be 1 from -2<=n<=2 and 0 elsewhere. I can easily do the stem from -2...2 but elsewhere... how do I also stem plot the zeros.? it does not have to be from -inf to inf but at least from -10 to 10
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