a-do aaaa aaab aaad aaba aabb aabd aada aaoo abaa abab abad abb- abba abbb abbo abda abdo aboa abob abod aboo adaa adab adad adao adba adda addd addo adob adod adoo adq- aoba aqda baaa baad baba babb babo bada badb badd bado baqa bbad bbbb bbbq bbdd bbdo boab boad boba bobb bobo boda bodb bodo boob bood d-bo daab daad daba dabb dabo dada dado dddd doab doba dobb dod- doda dodd dodo doob dood dqdb obad obba obbo oboq odbo odda oddd odoo ooaa ooba ooda oooo qabo qada qoob qqqq