Which of the following is (are) repeating unit(s) of step-growth polymers? 
Definitions:
Stigma
A mark of disgrace associated with a particular circumstance, quality, or person, often leading to discrimination.
Mental Illness
A wide range of mental health conditions that affect mood, thinking, and behavior.
Disability
A physical or mental condition that limits a person's movements, senses, or activities.
Prevalent
Commonly occurring or widely accepted in a particular time or place.
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