d=-7-4=-3
a1=-7
a2=-4
a3=-1
a4=-1+3=2
a5=2+3=5
a6=5+3=8
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d=-7-4=-3
a1=-7
a2=-4
a3=-1
a4=-1+3=2
a5=2+3=5
a6=5+3=8