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a7=7 /7
a=1
a3+a8=11
a11=11 /11
a=1
a3+a8=11 a3=a2+r a8=a2+6r
a2+a2+3r=7
a2+r+a2+6r=11
2a2+3r=7
2a2+7r=11
4r=4
r=1
a2=2
a1=1
an=n