x2+y2−8y−9=0x^{2}+y^{2}-8 y-9=0x2+y2−8y−9=0
x2+y2−8y−6=0x^{2}+y^{2}-8 y-6=0x2+y2−8y−6=0
x2+y2+8y−6=0x^{2}+y^{2}+8 y-6=0x2+y2+8y−6=0
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