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.3.
1/2 |......|.......|
3/4 |......|......|......|.......|
5/8 |........|.......|.......|.......|.......|........|........|.........|
1/4 |......|........|.......|.........|
1/8|......|......|......|.......|.......|.......|......|.......|
3/8 |.......|.......|.......|......|.......|.......|.......|...... |
7/8 |......|.......|......|.......|........|.......|........|.......|
3/2 |............|.......|
5/4 |................|....|
7/4 |...........|...........|
4.
1/2 ----
1/4 --
0----1/2--3/4----5/4----7/4----9/4----11/4