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

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

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