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This paper proposes a generic mathematical formalism for the combination of various structures : strings , trees , dags , graphs , and products of them .
 hyponym of: strings, structures; conjunction: strings, trees; hyponym of: trees, structures; conjunction: trees, dags; hyponym of: dags, structures; conjunction: dags, graphs; hyponym of: graphs, structures
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 hyponym of: strings, structures; conjunction: strings, trees; hyponym of: trees, structures; conjunction: trees, dags; hyponym of: dags, structures; conjunction: dags, graphs; hyponym of: graphs, structures