Clever Vocabulary: linked words and phrases Points gathered in traces or rings chain column crocodile file in single file interrow line queue ring rope row solitary file string thread tier educate two-tier You can even uncover connected phrases, phrases, and synonyms from the subjects: inconspicuous imperceptible smaller unobtrusive insignificant trivial https://www.youtube.com/watch?v=7OfVkYHB1OY