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1. (n) any number of entities (members) considered as a unit
2. (v) arrange into a group or groups; "Can you group these shapes together?"
3. (n) (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
4. (v) form a group or group together
5. (n) a set that is closed, associative, has an identity element and every element has an inverse
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