code: func StringToLexType(tag string) lingo.LexemeType {
  	var lexType lingo.LexemeType
  	switch tag {
  	case "NUM":
  		lexType = lingo.Number
  	case "PUNCT":
  		lexType = lingo.Punctuation
  	case "SYM":
  		lexType = lingo.Symbol
  	default:
  		lexType = lingo.Word
  	}
  	return lexType
  }
docs: // TODO : CHECK