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subgroup [subgroups]▼(group within a larger group)noun[UK: ˈsʌb.ɡruːp] [US: ˈsʌb.ˌɡruːp]
subset [subsets]▼(group contained in a larger group)noun[UK: ˈsʌb.set] [US: ˈsʌb.ˌset]
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