$\hat{\mathrm{i}}\times \left(\hat{\mathrm{a}}\times \hat{\mathrm{i}}\right)+\hat{\mathrm{j}}\times \left(\hat{\mathrm{a}}\times \hat{\mathrm{j}}\right)+\hat{\mathrm{k}}\times \left(\hat{\mathrm{a}}\times \hat{\mathrm{k}}\right)$ is always equal to 

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