PoreMatMod.jl searches for all subgraphs G p of the parent crystal structure graph G p that are isomorphic to the query graph G q using Ullmann's subgraph isomorphism algorithm [ ]. The set of subgraph isomorphisms often includes symmetry-equivalent subsets of bijections with the same domain G p . Each bijection in a symmetry-equivalent set maps the nodes in V p to the nodes in V q via a different permutation. E.g., there are four symmetry-equivalent isomorphisms between a subgraph of the BDC linker and the p-phenylene fragment (see Fig. ). PoreMatMod.jl groups the search results-the set of isomorphisms between subgraphs {G p,i } and G q -by symmetry-equivalence.