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1
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2-3
1
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4-5
3
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6-7
5
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8-9
7
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10-11
9
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12-13
11
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14-15
13
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16-17
15
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18-19
17
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20-21
19
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22-23
21
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24-25
23
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26-27
25
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28-29
27
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30-31
29
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32-33
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34-35
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36-37
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38-39
37
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40-41
39
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42-43
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44-45
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48-49
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50-51
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52-53
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54-55
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56-57
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58-59
57
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60-61
59
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62-63
61
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64-65
63
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66-67
65
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68