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The final design concept for the western span between San Francisco and Yerba Buena Island was still undecided in 1931 , although the idea of a double-span suspension bridge was already favored .
 location: San Francisco; location: Yerba Buena Island
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: San Francisco; location: Yerba Buena Island