collection
To exchange positions (with another)
Initialism of see you next time. / Initialism of see you next Tuesday.
(geology) A building stone, one of the group of the Paris basin, almost entirely made up of many-chambered microscopic shells.
A set of items or amount of material procured or gathered together. / Multiple related objects associated as a group. / The activity of collecting. / (topology, mathematical analysis) A set of sets.
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