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In agriculture , a " living mulch " is a cover crop interplanted or undersown with a main crop , and intended to serve the purposes of a mulch , such as weed suppression and regulation of soil temperature .
 cover crop, weed
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 cover crop, weed