Internal symmetry.
Internal dualism.
Structural dualism.
Disymmetry posits that a structure externally symmetrical is by definition INTERNALLY symmetrical. Internal symmetry is by definition structurally dualistic (disymmetric). Thus structure is by definition internal dualism.
Structure and internal dualism share a bijective (cotingent) relationship. Internal dualism is cotingently structure and structure is cotingently internal dualism.
This result conspicuously self-referentializes a cotingent relationship between asymmetry and contiguity.