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elephants have been observed digging holes to drink water and then ripping bark from a tree , chewing it into the shape of a ball , filling in the hole and covering over it with sand to avoid evaporation .
 product producer: elephants, holes
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:
 product producer: elephants, holes