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Lithium, sodium, potassium, rubidium and cesium are collectively known as the alkali metals.
Pentavalent atoms are collectively known as prictogens.Trivalent atoms are collectively known after their simplest member, boron.
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The middle ear.
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Industrialization in southern Italy has been hampered because of the criminal groups known as the mafia. The Mafia was created in the mid 1800's.
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Lithium, sodium, potassium, rubidium and cesium are collectively known as the alkali metals.
There are seven colors in the rainbow. They are collectively known as ROY G BIV, which is shortened for the color names.
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Confederate.
The Union
How are Britt,Lee,O'Reilly,Vin,Chris,Harry and Chico collectively known in the title of a film
Pentavalent atoms are collectively known as prictogens.Trivalent atoms are collectively known after their simplest member, boron.
Your groups should be mutually exclusive and collectively exhaustive.