Six Pairs of Twins Show Group Gymnastics in a Primary School

On May 24, reporters see six pairs of twins practising group gymnastics in Wuzhai primary school of boat center in NaJing County. They are rehearsaling for the celebration of Children's Day.
 
It is learned that there are six pairs of twins among the 200 students in Wuzhai primary school. They are one pair of pigeon twins, one pair of twin brothers and four pairs of twin sisters. In order to present something interesting and funny for the Children's Day, twin brothers Chen Mingjie and Chen Mingchao in grade six proposed for the twins to show such a special gymnastic for the school. Other twins responded actively, and the whole school agreed on it unanimously.