Question: Which associate of Thomas bryan Martin is also the president of Carmichael ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Thomas_Bryan_Martin> <http://dbpedia.org/ontology/associate> ?uri. <http://dbpedia.org/resource/William_Carmichael_(diplomat)> <http://dbpedia.org/property/president> ?uri}