code: def regular_half(circuit: circuits.Circuit) -> circuits.Circuit:
      
      return circuits.Circuit(
          ops.Moment(op
                     for op in moment.operations
                     if not isinstance(op, ops.PauliStringPhasor))
          for moment in circuit)
docs: Return only the Clifford part of a circuit.  See
      convert_and_separate_circuit().
  
      Args:
          circuit: A Circuit with the gate set {SingleQubitCliffordGate,
              PauliInteractionGate, PauliStringPhasor}.
  
      Returns:
          A Circuit with SingleQubitCliffordGate and PauliInteractionGate gates.
          It also contains MeasurementGates if the given
          circuit contains measurements.