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Group within a group (6)

Solution has appeared in 2 crosswords (1 across and 1 down):

• Quick crossword No 16,206 — 2022-04-15 23:00:43
  4D: Group within a larger group (6)
• Quick crossword No 15,646 — 2020-06-29 23:00:50
  8A: Group within a group (6)