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Quaternary
QUATERNARY

Definitions:

i. The number four.

ii. A set of four.

iii. (capital; geology) the Post-Tertiary era or group of strata (Pliestocene and Recent).
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See perfect number (1).

See perfect type (1).

See perfect specificity.

See perfect four (1).
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See perfect era (1).

See perfect rock (2).

See perfect group (1).

See perfect nature (2).

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