Symmetric relations.
Signs of the corresponding functions are the same.
Function interaction: 1 ↔ 2, 3 ↔ 4, 5 ↔ 6, 7 ↔ 8.

The partners supplement each other's dimensionalities in each horizontal block, which provides favorable conditions for comprehensive information processing by the high-dimensional blocks (in case if cooperation regards the respective information elements). The supplementing effect in the low-dimnsional blocks superego and superid covers one-dimensional functions of the partner. Mirror ralations are favorable for professional cooperation. In marriage the partners might feel lack of information feed to superid.