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8 14<br />
7<br />
9<br />
12 20<br />
13 5<br />
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10<br />
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3<br />
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1<br />
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17<br />
12<br />
20<br />
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19<br />
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18<br />
Fig. 1 Fig. 2<br />
Fig. 3 Fig. 4