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NASA officials said the four candidate crewmen will start training for their mission in April at the Marshall Space Flight Center in Huntsville , Ala .
 Marshall Space Flight Center, Huntsville; Marshall Space Flight Center, Ala; Huntsville, Ala
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: Organization based in, Located in, Live in, Work for, Kill 
Text: {0} 
Answer:
 Marshall Space Flight Center, Huntsville; Marshall Space Flight Center, Ala; Huntsville, Ala