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This work was supported by National Natural Science Foundation of China (Grant Nos. 61873136, 61374062, 61673013, 61573203, 6160- 3288), Natural Science Foundation of Shandong Province for Distinguished Young Scholars (Grant No. JQ201419), and Natural Science Foundation of Shandong Province (Grant Nos. ZR2015FM023, ZR2016- JL022).
Appendixes A–C.
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Figure 1
(Color online) (a) A digraph; (b) its line graph.