interpreting a step signal.

The image is described by y(t)=t-tu(t-1)-t(u(t-2))+t(u(t-3)). I don't get this. please point out where the signal turns on and off and why. To me, it looks like a ramp, a step, and then a ramp with neg amplitude. I can do the rest of the problem, i.e. the laplace transform and the other parts. Thanks.

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