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Chalisa's achievement

Speed III

Finish a collection of 11k or lower with an avg. time of under 5 seconds.*

Uncommon

*The collection must contain at least 100 problems.

Recently completed by

Sebastian Pini 5k,

Carolina Feng 12k,

Артём Козел 9k,

FireScourge 3k,

David Steinberg 9k,

KeimaCorner 9k,

Marcello Virzì 12k,

Lachlan Fletcher 9k

and 294 others.