10/20
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25/50
50/100
75/150
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300/600
400/800
500/1,000
600/1,200
800/1,600
1,000/2,000
1,500/3,000
2,000/4,000
3,000/6,000
4,000/8,000
5,000/10,000
6,000/12,000
The DVD allows you to start at any level and skip levels as you get to them, but the structure cannot be modified.