Hello,

I was able to simplify the circuit as follows:

However, I received the following error:

Incorrect: Your resulting output doesn’t look quite right.

Incorrect: more than 1 T gates are needed.

Incorrect: the optimal depth of the circuit is not 4.

Incorrect: the optimal T-count of the circuit is not 1.

Incorrect: the optimal T-depth of the circuit is not 1.

In wire 0: the pairs of H-gates, T-gates, and adjoint T-gates cancel each other, and one H-gate remains

In wire 1: the pair of H-gates cancel each other and the 2 pairs of T-gates become S-gates, one T-gate, and H-gate remain

In wire 2: the pair of H-gates cancel each other, the 2 pairs of adjoint T-gates become adjoint S-gates, and one H-gate remains

I am not sure where the simplification went wrong.