How to understand the "single clear pulse" in Feng Shui

How to understand the "single clear pulse" in Feng Shui? -"Zen and clear pulse" is relative to "double mountains". The so-called "Shuang Shan's pulse" refers to the two words on the twenty-four mountains, that is, Shuang Shan's pulse, such as Renzi, Zigui and Guichou's next Shuang Shan pulse. This way of coming pulse will lead to confusion of yin and yang coming pulse in Longshan, which is not easy to use. A single pulse is a pulse of a word on the compass. The single clear pulse will not appear the phenomenon of the yin and yang of Longshan, and it is pure and clear, which is conducive to sitting upright.