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R Ulan'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

Calcogen (Calcogen) 3k,

Dimensional 5k,

Bratva Shop 8k,

Xavier Richard 2k,

Ben Anderson 6k,

Sebastian Pini 8k,

Carolina Feng 12k,

Артём Козел 9k

and 301 others.