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How often do you update the statistics? And how do you plan to sort the participants in the next stage?
1) 1.1-2.2-1.3-2.4-1.5-2.6
2) 2.1-1.2-2.3-1.4-2.5-1.6
Position in the group - group number
Added 3 minutes later
Two participants from each group will advance
... прийти ... увидеть ... победить