Crossword puzzle clue "groups of three"

Here are the possible solutions for groups of three clue

Answer
Clue
Relevancy
subsets
Clue
Groups within groups
Groups with groups
brainteaser
Clue
"If three hens lay three eggs in three days ...," e.g.
Definition
something (as a puzzle) that demands mental effort and acuity for its solution
sos
Clue
Three short, three long, three short
abo
Clue
Three blood groups
Definition
(offensive) (short for) an aborigine
areacodes
Clue
Three-digit groups that begin phone numbers: 2 wds.
metis
Clue
One of three Canadian aboriginal groups
Definition
(French) the (male) offspring of a white person and an American Indian
set
Clue
Card game based on matching groups of three

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