Fig. 3: Illustration of 18 shortest paths.

We arbitrarily selected three nodes in each of the three randomly sampled block modules which consist of a PISSB module (yellow), a ISSB module (red), and a NISSB module (blue). Paths between the three arbitrary nodes of the PISSB module and the three arbitrary nodes of the ISSB module are shown, resulting in nine paths. Same procedure was conducted for NISSB-ISSB node pairs, resulting in the other nine paths. See Supplementary Notes for the bilingual version of this figure.