From the result, we can find that not only common words which may be included in a "basic vocabulary", such as " (exist)", " (certain/some)" 2 , " (do')", " (thing)", etc., but also words which are not so common but are often used in 2 It is used to say something undetermined or to avoid saying something exactly even if you know that.
some words in the top ranked words, such as "A" and "B", seem not to be appropriate for defining vocabulary.