a-ak a-do a-ok aaaa aaac aaad aaap aaca aacc aacd aack aaco aacp aada aadc aaka aaoo aapa aapc aapo acaa acac acad acap acca accc accd acco accp acda acdc acdp ackd acoa acod acop acpa acpd adaa adac adad adak adao adap adcc adda addc addd addo adoc adod adok adoo adp- akaa akao akap akca akka akko akok akpo aoca aokp aopo apac apak apao apap apca apcc apcd apco apda apdd apo- apoc apod apoo apop appa appc appd c-cd caaa caac caap cac- caca cacc cack caco cada cadc cadd cado caka caod capa capc capd capo capp ccaa ccac ccad ccap ccca cccc cccp ccdc ccdp ccoc ccod ccpa ccpp cdaa cdac cdad cdda ckac ckck ckco ckdo ckoa ckoc ckoo ckpc coad coak coca cock coco cocp coda codd cok- coka coko cood cook coop copa copd copo copp cpaa cpac cpad cpap cpca cppa cppd daad daap daca dada dado daka dako dapa dapp dcca dccc dccp dcop dcpo dddd ddoc ddpo dkdc doak doap doca dock doco dod- doda dodd dodo doka doko dood dook doop dopa dopo dopp dpaa dpac dpcp dppa dppc kaaa kaak kaap kacc kacd kaco kacp kad- kada kadd kado kaka kakc kakk kako kaoa kaoc kaok kap- kapa kapc kapo kapp kcaa kcac kcad kcap kcca kccc kccd kcck kcda kcdc kcdd kckc kckk kcko kcpa kcpc kcpo kdaa kdac kdad kdak kdao kdap kdca kdcc kdcd kdco kddc kddd kddk kdka kdkd kdkk kdko kdoc kdok kkaa kkac kkap kkcd kkck kkco kkda kkdc kkdd kkdo kkkk kkoa kkoo kkpc kkpk koac koak koap koca kocd kock kocp koda kodk kodo koka kokc kokk koko kokp kooc kook kooo koop kopa kopp kpac kpad kpak kpao kpcc kpda kpdc kpdo kpkk kpoa kpoc kpod kpok kpoo kpop kppc kppd kppk kppo kppp ocac ocad ocak ocap occa occc ocpa ocpd ocpp odac odda oddd odoo odop okak okap okka okko okok okpo ooaa ooak ooda oooo opap opca opo- oppa oppo paak paap paca pacd pack paco pada padd pado paka pako paoc papa papp pcaa pcad pcap pcca pccc pcoa pcod pcpp pdac pdca pdcp pdoc pdpa poad poak poca pocd pock poco pod- poda podd podo poka poko pood pook poop pop- popa popc popo popp ppac ppad ppap ppcc ppcd ppdk ppoa ppod pppa pppd pppo pppp