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tree roots are attracted to the water vapor leaving the pipe and they follow the vapor trail to the source of the moisture , which are usually cracks or loose joints in the sewer pipe .
 component whole: sewer, pipe
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: component whole, NA, instrument agency, member collection, cause effect, entity destination, content container, message topic, product producer, entity origin 
Text: {0} 
Answer:
 component whole: sewer, pipe