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The character and show , created by Richard Levinson and William Link , popularized the inverted detective story format , which begins by showing the commission of the crime and its perpetrator ; the plot therefore usually has no " whodunit " element , and instead revolves around how a perpetrator known to the audience will finally be caught and exposed ( sometimes referred to as a " howcatchem " ) .
 person: Richard Levinson; person: William Link
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Richard Levinson; person: William Link