Further, in (Mukherjee et al., 2007), the authors define the Phoneme-Phoneme Network or PhoNet as the one-mode projection of PlaNet onto the consonant nodes, i.e., a network G = V C , E cc , where the nodes are the consonants and two nodes v c and v c are linked by an edge with weight equal to the number of languages in which both c and c occur together.
phoNet can be expressed as a matrix B (see Fig.