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2. \left(x+1\right)^{2}+\left(y-1\right)^{2}=1
3. x=-1\ \left\{2<y<8\right\}
4. x=1\ \left\{2<y<8\right\}
5. x^{2}+\left(y-8\right)^{2}=1\ \left\{8<y\right\}