Next, we focus on the 11,190 ordered structures of the ASR subset to avoid duplicates. By studying the distribution of the number of structures per corresponding net, we observe that this distribution drops faster for unknown nets than for known ones. This is not surprising since we expect known nets to correspond to the most common occurring in nature, whereas unknown nets should only correspond to at most a few corresponding structures. Indeed, among the latter, 1,488 unknown nets only correspond to one MOF structure each, and 302 to two structures. Yet, 5 of them still correspond to thirty MOF structures or more each: we manually checked through the TopCryst interface that these 5 nets were part of the ToposPro database, but we could not do so for all the unknown nets since these databases are not open. In comparison, for known nets, 110 of them only correspond to a single MOF structure, 54 to two and 38 to thirty or more each. These most represented nets are detailed in Figure : pcu (primitive cubic lattice), dia (diamond) are by far the most common, together accounting for 27% of know nets, followed by ths, srs and pts. For zeolitic nets, ABW, SOD (sodalite) and BCT are the most commonly encountered.