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They had five children : Lieutenant-General Alan Colquhoun Duff ( 1896-1973 ) who published books under the nom-de-plume " Hugh Imber " ; Sir James Fitzjames Duff ; Patrick William Duff ( 1901-1991 ) , Regius Professor of Civil Law at Trinity College , Cambridge ; Mary Geraldine Duff ( 1904-1995 ) , principal at Norwich Training College , Norwich ; and Hester Laura Elisabeth Duff ( 1912-2001 ) .
 Duff, Sir James Fitzjames Duff, Duff, Trinity College , Cambridge, Duff, Norwich, Norwich, Duff
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Duff, Sir James Fitzjames Duff, Duff, Trinity College , Cambridge, Duff, Norwich, Norwich, Duff