bool hasLeftNode = ( !L._leftLine->_rightNodes.empty() && leftEdgeShared );
bool hasRightNode = ( !L._rightLine->_leftNodes.empty() && rightEdgeShared );
bool hasOwnLeftNode = ( !L._leftNodes.empty() );
bool hasOwnRightNode = ( !L._rightNodes.empty() );
bool hasLeftNode = ( !L._leftLine->_rightNodes.empty() && leftEdgeShared );
bool hasRightNode = ( !L._rightLine->_leftNodes.empty() && rightEdgeShared );
bool hasOwnLeftNode = ( !L._leftNodes.empty() );
bool hasOwnRightNode = ( !L._rightNodes.empty() );