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Mathematical theme of building blocks
First, there should be two components.

So make sure that two building blocks are built at the same time.

Sticking to pies is the same principle.

Need classmate 1 classmate 2 classmate 3.

Same as 65438 +0 column+same as 2 column 4.

Then use 1 castle +3 train 4.

Then there is Tang 2 Castle+Tang 3 Castle 4.

So it is 4*3= 12 (minutes)

The rule is that you put a pie on your math book.

I forgot the formula. Sorry, give it to me personally ~ ~ ~

If you don't understand, you can ask.