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In his book The Secret of Perfect Living , Mangan created a psychological system slightly resembling transcendental meditation , in which readers were encouraged to engage their subconscious minds and obtain specific mental states by focusing their attention on mantra-like one-word affirmations called switchwords ; for example , focusing on " GIGGLE " would be useful " to get in mood for writing . "
 person: Mangan
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Mangan 
Answer:
 person: Mangan