code: private boolean isSymmetric(Circuit other)
      {
          return getIn().equals(other.getOut()) && getOut().equals(other.getIn()) && type == other.type.getSymetric();
      }
docs: Check if transition if symmetric with other.
  
  @param other The other transition to check with.
  @return <code>true</code> if symmetric transition, <code>false</code> else.