In order to welcome the National Day, gardeners should put flowers in the square. One way is to discharge 9 pots of flowers in 8, and the other way is to discharge 7 pots of flowers in 6. How to put it? Just pretend to be Tian Zi.

If you pull the four pots on the four corners to both sides and arrange them in three long and three short rows, as follows:

A - B - C

Germany-Britain-France

G - H - I

You can arrange 9 pots of flowers in line 10, with 3 pots in each line, that is:

ABC、DEF、GHI、ADH、BFI、BDG、CFH、BEH、CEG、AEI