Learning Letters Unconsciously3

Children can learn letters unconsciously by the software……
The software has the function of Linking games, so children like it very much……
When children click a letter,the software will read the letter automatically,so children can learn letters unconsciously……
The letters's frequency of occurences depend on Ebbinghaus forgetting curve……
The pictures are big, children can click them very easily……
the software can admire the children……