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- $ I\\\left( { - 1;\\\,0;\\\,0} \\\right)$.
- $ O\\\left( {0;\\\,0;\\\,0} \\\right)$.
- $ K\\\left( {0;\\\,0;\\\, - 1} \\\right)$.
- $ J\\\left( {0; - \\\,1;\\\,0} \\\right)$.