Wilfully chooses two figures (in other words wilfully chooses a number from 10~99), adds together this number ten with the units place, again the number which wilfully chooses subtracts this sum. For example: You elect the number is 23, then 2+3=5, then 23-5=18 discovers in the graph with several corresponding graphs which finally obtains, and keeps firmly in mind this graph in the heart, then clicks on the water 晶球. You can discover that, the water 晶球 demonstrated the graph was that graph which you just in the heart took down.