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Find standard basis vectors for $R^{4}$ that can be added to the set $\left\{\mathbf{v}_{1}, \mathbf{v}_{2}\right\}$ to produce a basis for $R^{4}.$$$ \mathbf{v}_{1}=(1,-4,2,-3), \quad \mathbf{v}_{2}=(-3,8,-4,6) $$