Fig. 3From: Generating normal networks via leaf insertion and nearest neighbor interchangeAn illustration of the proof of Proposition 3. a The reticulate node parent r of n+1 has two adjacent parents. b The reticulate node parent r of n+1 has two non-adjacent parents. c The parent and sibling of n+1 are both a tree node. d The parent of n+1 is a tree node, whereas the sibling of n+1 is a reticulate nodeBack to article page