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The process of forming polymers from two or more differentmonomeric units is called copolymerization. Multiple units of each monomer arepresent in a copolymer. The process of forming polymer Buna−S from 1,3-butadiene and styrene is an example of copolymerization

Nylon 6, 6 is also a copolymer formed byhexamethylenediamine and adipic acid.
