$$\left. \begin{array} { l } { A \times \{ 1 , 2 , 4 , 7 , 10 \} , B \{ 1 , 3 , 5 , 6 , 8 , 9 \} } \end{array} \right.$$
$A,2A,4A,7A,10A,\ B,3B,5B,6B,8B,9B$
