3888
in the 1880s the railroad had dug a large water well here , which had later turned into a cold bubbling mudpot driven by naturally-occurring pressurized carbon dioxide gas .
 product producer: railroad, well
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  railroad, well 
Answer:
 product producer: railroad, well