beg beg2right right right2end -middle middle end beg beg2right right right2end -middle middle end beg beg2left left left2end -middle middle end beg beg2left left left2end -middle middle end beg beg2right right right2end -middle middle end beg beg2left left left2end -middle middle end beg beg2right right right2end -middle middle end beg beg2left left left2end -middle middle end beg beg2left left left2end -middle middle end beg beg2right right right2end -middle middle end