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Ling Xiao actually realized after memorizing the spells from the "Complete Collection of Refining Array Spells" that these spells were like live musical notes, simply remembering the characters was not enough.
Every spell, when chanted, had different intonations and pace and also required the coordination of Soul Power to be effective.
That made things difficult.
So, he temporarily gave up on understanding the elementary Array Formation spells and instead focused all his energy on the rudimentary array formations and arrays for the layman.
With this approach, combined with the "Sealing Gods Record," it was easier to grasp the mysteries of the array formations.
However, even so, for an average disciple from the Sect, it would take at least over ten years to completely memorize and fully understand these fundamentals.
For a genius-level Martial Artist, the time might be shorter, but it still would require two to three years.