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The Doctor and Martha make numerous references to Shakespeare 's appearance : she notes that he looks nothing like his portrait , and wonders why he is not bald , while the Doctor says he could make his head bald if he rubs it and later gives him a ruff to keep ( calling it " a neck brace " ) .
 person: Martha; person: Shakespeare
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:
 person: Martha; person: Shakespeare