Because of the anatomical location of some points, there exists a relationship between them, For example points that are medial and lateral to a certain fixed point in the middle make a good combination. For example,
Neiguan (PC6)    Waiguan(S J5)
Sanyinjiao (SP6)    Xuanzhong (GB39)
Xuehai (SPIO)     Liangqiu (ST34)
  
    
            






