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.
ILE - The Seeker
:Burning curiosity for everything new, inquisitiveness; unpredictable behavior; creative excitement; ability to recognize essence under the surface.
: Need for support in everything that concerns health, well-being, and leisure activities.
SEI - The Epicurean
: Focus on well-being and physical comfort; ability to create comfortable and pleasant feelings; good cooking capabilities.
: Seeing the surface rather than the essence; need for help in foreseeing potential outcome of actions and in evaluation of his/her potential capabilities.
LII - The Analyst
: Analytic thinking, classification, generalization; striving to understand general principles, for creating a model of the world systematization.
: Reserved and cautious in relations with others poorly understands emotional nuance; fears looking obtrusive and therefore prefers keeping a distance in communication.
ESE - The Enthusiast
: Cannot live without people and communication with them; creates atmosphere of an emotional feast for self and others; charges people with enthusiasm and good tonus.
: Difficulty in prioritization and information structuring; often makes precipitate decisions based on emotions.