sumo#language  system of signs for expressing thought; the system can be either natural or artificial, i.e. something that emerges gradually as a cultural artifact or something that is intentionally created by a person or group of people
  supertype:  sumo#linguistic_expression  content bearing objects which are language-related, i.e. both languages and the elements of languages, e.g., words
  subtype:  p{sumo#animal_language pm#non_animal_language}  #linguistic_communication
  part:  #lexis__lexi  all of the words in a language; all word forms having meaning or grammatical function
  part:  #lexicon__vocabulary__mental_lexicon  a language user's knowledge of words

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