1=1504423456789101112131415163x1,2BDBDABDABDABDABDCC1ASASASASCC2173CC2CC2RC11819cCRC2RC2RC1RC2RC2ASRC220cCRC2CC2RC2RC2ASRC221cCRC2CC2RC2ABDBDRC2ESASRC222cCRC2RC2RC2ASRC223cCRC2CC2RC2RC2ASRC224cCRC2CC2RC2ABDBDRC2ESASRC2