Here is how Filatova approached Duality descriptions in her english socionics book. She describes how each type's Weakest function (Suggestive) works like a lock, and each type's Strongest function (Base) works like a key.
IEE - The Initiator
: A talent for sensing promising opportunities, for discovering talents of people, for understanding the essence of matters.
: Weak sense of own body and needs, problems with household organization, carelessness in financial issues, preference for delegating such matters to someone else.
SLI - The Craftsman
: Dominance of the sensual world, harmony. balance and expediency in everything, aesthetics combined with practicality, good sense of own body, capability of creating comfort and well-being.
: Weak understanding of hidden processes and of one's own hidden capabilities, gratitude to those who help to understand his own iniquity.
LSE - The Professional
: Dominance of reality; need for people to submit to objective laws; importance of efficient work, high quality products, observation of law and order.
: Poorly understands nuances of feelings; holds to accepted behavioral conventions; confused by non-standard ethical situations; difficulty in changing habits.
EII - The Psychologist
: Sensitivity to others; obedient to moral norms; capable of empathizing and of establishing a good psychological climate; and expert in traditions.
: Insecure about ability to efficient work; excessive amounts of time and effort spent in achieving necessary results.