if (NULL != rootEdge->tail->parentEdge)
updateSubTreeAfterNNI(A, v, rootEdge->tail->parentEdge, closer, further, 0.5*dcoeff, DOWN);
updatePair(A, rootEdge, rootEdge, closer, further, dcoeff, DOWN);
if (NULL != rootEdge->tail->parentEdge)
updateSubTreeAfterNNI(A, v, rootEdge->tail->parentEdge, closer, further, 0.5*dcoeff, DOWN);
updatePair(A, rootEdge, rootEdge, closer, further, dcoeff, DOWN);