Help using Base SAS procedures

a question about regression

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a question about regression

here is the data
r t1 t2 t3
2 -1 1 0
3 -1 0 1
2 0 -1 1
...
r is profits
ti is time -1 (buy) 1(sell)
I want to estimate the profits of all the periods r1 r2 r3, and r1=1
how to use proc reg to do this and how do i let r1=1?

2= r2-r1 --r2=2
3=r3-r1 --r3=4

thanks
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