a1=1-3*1
a1=1-3
a1=-2
a2=1-3*2
a2=1-6
a2=-5
r=a2-a1
r=-5-(-2)
r=-5+2
r=3
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a1=1-3*1
a1=1-3
a1=-2
a2=1-3*2
a2=1-6
a2=-5
r=a2-a1
r=-5-(-2)
r=-5+2
r=3