this one is really simple, i think divide it as half (6-6)
( f! u- X6 L) k* o. I1 V' |weigh 3-3 , if one side is heavier, weigh 1-1 -> you will know which one is heavier
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weigh 3-3 of the other group (2nd chance)# b# m5 J: s( g. |- Y
then weigh 1-1 from heavier group (3rd chance)-> you will know which is heavier |