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plot (3/2)^x,(3/2)^(x+1),-(3/2)^(x+1),2-(3/2)^(x+1) for x=-2..3
plot (3/2)^x,(3/2)^(x+1),-(3/2)^(x+1),2-(3/2)^(x+1) for x=-2..3
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