There are four kinds of children's classics, and the effects are from low to high, namely cyan, blue, purple and orange.
Have the opportunity to synthesize classics:
There is a 65% chance that two green classics will be combined into one blue classic.
Two blue classics have a 45% chance of synthesizing a purple classic;
Two purple classics have a 35% chance of synthesizing an orange classic;
Two orange classics 100% are combined to get a random orange classic.
If the synthesis is successful, a higher quality card will be obtained; If the synthesis fails, the ancient books with fixed pages will be obtained according to the quality of the synthesized ancient books.