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np. ulamki
4/6 6/9 8/12
(4+10)/(6+15)=14/21=2/3=4/6 4/6
(6+10)/(9+15)=16/24=4/6=2/3=6/9 6/9
(8+10)/(12+15)=18/27=2/3=8/12 8/12