What is the principle of coin fortune telling?

I don't seem to have seen any professional books on this subject, but I have seen this six-coin divination method in novels, which is more convenient and faster than three coins. Three coins have to be tossed six times to form a divination, and six coins can become a divination at a time, so this divination method is occasionally used and the accuracy is not bad.

The specific starting method is to throw six coins at a time and stop on the table, from left to right (right to left is also possible), with positive heads and negative tails, so that one coin is a hexagram and six coins can become hexagrams. Because there is no movement, the current time of divination is divided by the remainder of 6 as movement. In essence, this method belongs to plum blossom easy number