Selecting Rows of table, based on duplicate or not so select all unique rows or not,

Hi, 
I want to select rows of a table  where the rows are unique or not , I have a couple of ways of doing this, 
group is probably best,   but i would be interested in anyone can suggest other approaches, not neccessarily better  just different,

so group ; 

let
  atable = #table(
    type table [One = text, Two = text, Three = text],
    {
      {"a", "b", "c"},
      {"b", "c", "d"},
      {"c", "d", "e"},
      {"d", "e", "f"},
      {"b", "c", "d"},
      {"a", "b", "c"},
      {"e", "f", "g"}
    }
  ),
  group = Table.Group(
    atable,
    Table.ColumnNames(atable),
    {{"n", each if Table.RowCount(_) > 1 then _ else null}}
  )[n],
  result = Table.Combine(List.RemoveNulls(group))
in
  result

or  Accumulate with range ; 

let
  atable = #table(
    type table [One = text, Two = text, Three = text],
    {
      {"a", "b", "c"},
      {"b", "c", "d"},
      {"c", "d", "e"},
      {"d", "e", "f"},
      {"b", "c", "d"},
      {"a", "b", "c"},
      {"e", "f", "g"}
    }
  ),
  combi =
    let
      tr    = Table.ToRows(atable),
      combi = List.Transform(tr, (x) => Text.Combine(x))
    in
      combi,
  tf = List.Transform(combi, (x) => List.Count(List.PositionOf(combi, x, Occurrence.All)) > 1),
  pos = List.PositionOf(tf, true, Occurrence.All),
  Custom1 = List.Accumulate(pos, #table({}, {}), (s, c) => s & Table.Range(atable, c, 1))
in
  Custom1

I was wondering if i could use List.TransformMany to simplify but i don't think so, so any ( helpful ) suggestions welcome. 

Richard.