18000
 Largely bombed out by the Germans in World War II , Rotterdam , the second largest city in the Netherlands after Amsterdam , has completed over the last 20 years several successful urban renewal projects that have left it with a thriving local economy the largest commercial port in the world . 
 country capital: Netherlands, Amsterdam
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
 Entity Pairs:  Netherlands, Amsterdam 
Answer:
 country capital: Netherlands, Amsterdam