**Input:** Two qubits in the state $\ket{00}$.

**Goal:**  Modify the qubits to the state $\frac{1}{\sqrt{3}} \big(\ket{00} + \ket{01} + \ket{10}\big)$ using post-selection.

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<details>
  <summary><b>Need a hint?</b></summary>
  Consider a 3-qubit state $\frac{1}{2}(\ket{00} + \ket{01} + \ket{11}) \otimes \ket{0} + \frac{1}{2} \ket{11} \otimes \ket{1}$.
  What happens when one measures the third qubit?
</details>
