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How the CSN functions to increase the rigor of the test for addition of new members to a COG as well as construction of minimal COGs. (A) COGs as constructed in ref. 4 by merging of triangles with common sides (CSN = 3). (B) A similar set of COGs (CSN = 4) as in A, but in each case one more congruent BeT is required for construction of each minimal COG and for addition of members (in this case by merging of tetrahedrons with common faces). (C) Shown is the minimal COG at CSN = 5.
