a-ii aaaa aaab aaac aaai aaap aaba aabb aabc aabi aabp aaca aacb aacc aaci aaco aacp aaib aaic aaii aaoo aapa aapc aapi aapo abaa abab abac abai abap abb- abba abbb abbi abbo abca abcb abcc abci abcp abia abib abic aboa abob aboo abpa abpc abpi abpp acaa acab acac acai acap acba acca accc acci acco accp aci- acia acic acip acoa acop acpa acpi aiai aiba aibo aica aicc aicp aiia aiib aiic aioc aioi aipa aipi aoba aoca aopo apac apai apao apap apba apca apcb apcc apco api- apia apic apio apip apo- apoc apoo apop appa appc ba-i baaa baba babb babi babo bac- baca bacc baci baco baia baib baic baio bapa bapc bapi bapp bbbb bbci bcaa bcap bcbc bcbp bcca bccc bcci bcia bcpp biao biap biba bibb bibi bibo bica bicc bici bico bio- bioc bioi bipa bipp boab boac boai boba bobb bobi bobo boca boco boi- boii boob booc boop bopa bopp bpai bpcp c-bo caaa caab caac caap caba cabi cabo cac- caca cacc caci caco caia caib caic caio caip caoi capa capb capc capi capo capp cbac cbbc cbca cbcc cbcp cbia cbpc cbpp ccaa ccab ccac ccai ccap ccba ccbc ccca cccb cccc ccci cccp ccic ccii ccip ccob ccoc ccpa ccpp ciaa ciao ciba cibc cibi cibo cica cicc cici cico ciia ciii ciob cipa cipo cipp coai coba cobb cobi cobo coca coco cocp coia coip coob coop copa copi copo copp cpaa cpac cpap cpbc cpca cpia cpic cpio cppa iaaa iaac iaai iaap iaba iaca iacc iacp iaia iapa iapp ibac ibca ibia icaa icab icac icai icao icap icbc icbp icca iccb iccc icci icco iccp icoc icpa icpc icpo iiac iica iiii iiio iioi iioo iiop iipa ioba iobi ioci iocp ioii ioio iooi iooo ipac ipba ipca ipcc ipop ippa ippc ippo oaic oapi obai obba obbo obia oboi ocab ocac ocap ocbc occa occc occi ocpa ocpp oiba oici oiii oipc ooaa ooba oobi ooia oooo opap opca opia opic opii opio opo- oppa oppi oppo paap paba paca paci paco paia paib paio paip paoc papa papb papi papp pbac pbcc pboc pbpa pcaa pcap pcba pcbc pcca pccc pcia pcip pcoa pcpb pcpp piai piao pibb pibi pica picc pici pico piia piip piob pipa pipi pipo pipp poba pobo poca poco poia poio poop pop- popa popc popi popo popp ppac ppap ppcc ppci ppib ppic ppoa pppa pppo pppp