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$1)\,\,\,\left( {2,0} \right)\,\,,\,\,\left( {3,\,0} \right)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,2)\,\,\,\left( {2,\,0} \right)\,\,,\,\,\,\left( {6,\,0} \right)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,3)\,\,\left( {1,\,2} \right)\,,\,\left( {4,\,2} \right)$
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