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George_NZ's achievement

Speed XII

Finish a collection of 4k or higher with an avg. time of under 10 seconds.*

Rare

*The collection must contain at least 100 problems.

Recently completed by

Алёна Киреева 3k,

MalikKarimov 2k,

StephaneLamy 1k,

YuriyStepanovich 12d,

Захарова Светлана 14k,

Vic Beloshenco 7k,

and 30 others.