/------------------------------------------------------------------- 909902/140-216 (1)
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      |         |        \----99---+                           \---------- 907523 (13)
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      |         |                                              \---------- 472338 (10)
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                |                                     /------------------- 917340 (3)
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                |                           /---100---+        /---------- 890257 (12)
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                |-------------59------------+                  \---------- 472939 (14)
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                |                           \----------------------------- 339154 (7)
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                \--------------------------------------------------------- 918095 (6)