a-do aaaa aaab aaad aaap aaba aabb aabd aabp aada aaoo aapa aapo abaa abab abad abap abb- abba abbb abbo abda abdo aboa abob abod aboo abpa abpd abpp abza adaa adab adad adao adap adba adda addd addo adob adod adoo adp- aoba aopo apao apap apba apda apdd apo- apod apoo apop appa appd aza- azab azad azap azaz azo- azoo azza azzo baaa baad baaz baba babb babo bada badb badd bado bapa bapp baza bazo bbad bbbb bbdd bbdo boab boad boaz boba bobb bobo boda bodb bodo boob bood boop booz bopa bopp boza bozo bpda bzzz d-bo daab daad daap daba dabb dabo dabp dada dado dapa dapp dazz dbpd dddd ddpo doab doap doba dobb dod- doda dodd dodo doob dood doop dopa dopo dopp doza dozo dpaa dppa dzbb obad obba obbo odbo odda oddd odoo odop ooaa ooba ooda oooo opap opo- oppa oppo ozd paap paaz paba pada padd pado papa papb papp paza pazo pbpa pdpa poad poba pobo pod- poda podd podo pood poop pop- popa popo popp pozo ppad ppap ppoa ppod pppa pppd pppo pppp zaba zabo zada zapp zaza zobo zoda zodd zoo- zoop zopa zoza zozo zzzz