a-do aaaa aaab aaad aaaf aaba aabb aabd aada aafa aafb aafd aaff aaoo abaa abab abad abaf abb- abba abbb abbo abda abdo abff aboa abob abod abof aboo adaa adab adad adao adba adda addd addo adfa adob adod adoo afaa afad afao afdb affa affo afoa afoo aoba baaa baad baaf baba babb babo bada badb badd bado baff bafo bbad bbbb bbdd bbdo boab boad boba bobb bobo boda bodb bodo bofa bofd boff boob bood boof d-bo daab daad daba dabb dabo dada dado dafa daff dafo dbfo dddd dfaf dffa doab doba dobb dod- doda dodd dodo doff doob dood doof faaa faad faba fabd fabo fada fadd fado fafa faff fafo fdoa ffff foad foaf foba foda fofo food foof oafo obad obba obbo odbo odda oddd odoo off- offa offo ooaa ooba ooda ooff oooo