28808
While a catenary is the ideal shape for a freestanding arch of constant thickness , the Gateway Arch is narrower near the top .
 location: Gateway Arch
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Gateway Arch 
Answer:
 location: Gateway Arch