much of a muchness
  非常相似,大同小異
  Much·ness, n. Greatness; extent. [Obs. or Colloq.]
     The quantity and muchness of time which it filcheth.   --W. Whately.
  Much of a muchness, much the same. [Colloq.] “Men's men; gentle or simple, they're much of a muchness.”
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