code: def make_oracle(input_qubits,
                  output_qubit,
                  secret_factor_bits,
                  secret_bias_bit):
      
  
      if secret_bias_bit:
          yield cirq.X(output_qubit)
  
      for qubit, bit in zip(input_qubits, secret_factor_bits):
          if bit:
              yield cirq.CNOT(qubit, output_qubit)
docs: Gates implementing the function f(a) = a·factors + bias (mod 2).