Regular Higher Genus Toroids

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Heptagonal Dodecahedron (type C) (form 3)
form 3
Vertices:  28  (28[3])
Faces:12  ({6 * 2} nonconvex heptagons)
Edges:42  (8 different lengths)
Symmetry:  3-fold Dihedral  (D3)
(values below based on integer coordinates)
Edge 1 (6):  sqrt(133)/5    ≈2.3065125189341591779
Edge 2 (6):  sqrt(601)/8    ≈3.0644126680328157134
Edge 3 (3):  3*sqrt(17)/4    ≈3.0923292192132454124
Edge 4 (6):  35/8    4.375
Edge 5 (6):  3*sqrt(17)/2    ≈6.1846584384264908247
Edge 6 (6):  7
Edge 7 (3):  sqrt(89)    ≈9.4339811320566038113
Edge 8 (6):  21/2    10.5
Volume:3873/20    193.65