Selecting points on the same channel but on separate parts of the channel can multiply the strength and provide cascading effects of the points. For example.
Neiguan ( PC6 ) Jianshi ( PC5 )
Erjian ( LI2 ) Sanjian (LI3)
Feishu ( BL13 ) Pohu ( BI42 )
Shenshu ( BL23 ) Zhishi ( BL52 )
Shangjuxu ( ST37 ) Xiajuxu (ST39)
Of course, local and vicinity point combination can also include points on different channels, such as:
Mingmen ( DU4 ) Shenshu ( BL23 )
Zhongwan (RN12) Liangmen (ST21)