141345
Composition Electoral stain typically contains a pigment for instant recognition , and silver nitrate which stains the skin on exposure to ultraviolet light , leaving a mark that is impossible to wash off and is only removed as external skin cells are replaced .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None