if (!leftProperty_.addLeftChain(this)) { rightProperty_.removeRightChain(this); return false; if (!rightProperty_.removeRightChain(this)) {
if (!leftProperty_.addLeftChain(this)) { rightProperty_.removeRightChain(this); return false; if (!rightProperty_.removeRightChain(this)) {
if (!leftProperty_.addLeftChain(this)) { rightProperty_.removeRightChain(this); return false; if (!rightProperty_.removeRightChain(this)) {