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INFINITE SPONGE POLYHEDRAL SURFACES
TETRA 6
PERIODIC SPONGE SURFACE SUBDIVIDES SPACE BETWEEN A UNIFORM TETRA-VALENT NETWORK AND ITS DUAL (NON-UNIFORM) NETWORK. CIRCULAR OPENINGS AT FACE-CENTERS (6)
CUBIC 12
DOUBLE-LAYER HYPERBOLIC SPONGE SURFACE, SUBDIVIDING BETWEEN CUBE'S CENTRE AND MID-EDGE POINTS, (DODECA-VALENT) NETWORK AND IT DUAL NETWORK. NETWORK AXES INTERSECT CUBE'S EDGE MIDPOINTS (12)
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