<-- I -->
shanghai_7 shanghai_3
bejing_1 bejing_2
nanjing_3 nanjing_4
najing_1 nanjing_2
chengdu_3 chengdu_2
shanghai_11 shanghai_9
nanjing_7 nanjing_8
shanghai_13 shanghai_12
nanjing_5 nanjing_6
nanjing_9 nanjing_10
chengdu_4 chengdu_1
shanghai_1 shanghai_10
chengdu_5 chengdu_6
shanghai_5 shanghai_6
shanghai_8 shanghai_2
artm_10 artm_11
artm_5 artm_9
artm_6 artm_8
artm_2 artm_4
artm_1 artm_7
shanghai_4 chengdu_7
chengdu_8 chengdu_9
chengdu_10 chengdu_11
shanghai_14
beijing_3
shanghai_15