Let $\overline{\mathrm{a}}=\overline{\mathrm{i}}+2 \overline{\mathrm{j}}-\overline{\mathrm{k}}$ and $\overline{\mathrm{b}}=\overline{\mathrm{i}}+\overline{\mathrm{j}}+\overline{\mathrm{k}}$. If $\overline{\mathrm{p}}$ is a unit vector such that $[\overline{\mathrm{a}} \overline{\mathrm{b}} \overline{\mathrm{p}}]$ is maximum, then $\overline{\mathrm{p}}$ =

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