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

Cross-interaction between the partners' ego and id blocks makes evident that both partners are competent only in two macro elements and are not competent in the other two macro elements. There is no full understanding between high dimensional functions because a vital superblock always "has its own opinions", i.e. obstinately  directed towards satisfying its own needs. Values and mental elements of one of the partners, stay out of the interest zone of the other. A similar situation is with the superego and superid blocks - superid values and interests of one of the partners do not interest and even irritate  his  partner.

Unlike  extinguishment relations,  function interaction is taking place between functions of the same dimensionality (as for the identical relations).  These relations are favorable for cooperation when working on tasks related to the high-demensional functions. In long-term relationships partners can feel lack of infromation feed to superid. Partners have the same one-dimensional functions (however in different blocks). Understanding between the one-dimensional functions depens on individual factors, full missunderstanding between partners is possible on the ground of these functions,  as well as disapointment due to lack of the expected support.

Function-elemental description of the interaction between the models  of LII<->ILI can fe found here.