A city is full of twins

Many twins are attracted by the contest and try to come to Mojiang to attend the activities.
 
In 2008, there were 647 pairs all together, which include 12 pairs came from foreign counties, 81 pairs came from the other province, 189 pairs came from Yunnan province, 56 pairs came from each nationality and 309 pairs came from the county. The oldest pair is 70 while the youngest are just 7 month.
"e are triplets."