aaaa aaab aaac aaal aaap aaba aabb aabc aabl aabp aabt aaca aacb aacc aacl aacp aact aala aalc aall aapa aapc aapl aapt aata aatc aatt abaa abab abac abal abap abat abb- abba abbb abbt abca abcb abcc abcl abcp abct abla abpa abpc abpp abta ac-t acaa acab acac acap acat acba acbl acca accc accp acct acla aclc acpa acpt acta actc actl actt al-p alaa alac alal alap alat alb- alba albc alca alcc all- alla alll alpa alpl alta apac apal apap apat apba apca apcb apcc apl- apla aplp appa appc appl appt apta aptc aptt at-l at-t ataa atab atac atal atap atat atca atcc atcl atla atta attp baaa baal baat baba babb bac- baca bacc bact bala balc ball balt bapa bapc bapp bapt bata batc batt bbbb bblb bcaa bcap bcat bcbc bcbp bcca bccc bccl bcpl bcpp bctc blaa blab blac blat blbt bpcp btaa btbp btcc btcl btla btlp bttb caaa caab caac caal caap caat caba cac- caca cacc cala calc call calp calt capa capb capc capp capt cat- cata catb catc catt cbac cbal cbat cbbc cbca cbcc cbcl cbcp cbct cblb cblc cbpc cbpp cbta cbtc cbtl ccaa ccab ccac ccap ccat ccba ccbc ccca cccb cccc cccl cccp ccla cclc ccpa ccpl ccpp cctb cctc cctl cctt clab clap clat clpb clpp cltb cltc cpaa cpac cpap cpbc cpca cplc cppa cptp ctab ctal ctba ctca ctcp ctpp ctta laaa laac laal laap laat laba laca lacc lacl lacp lact lala lall lapa lapb lapc lapp lapt lata latc latt lbcc lcac lcat lcbc lcca lccc lcpa lcpc lcpl lctl llat llcc lllc llll lpac lpla lppl lptb ltac ltap ltbl ltcc ltpa lttc paal paap paat paba pabt paca pact pala pall palp palt papa papb papp pata patt pbac pbcc pbpa pcaa pcap pcba pcbc pcca pccc pccl pcll pcpb pcpp plaa plab plac plap plat plcc plpa plpp pltt ppac ppal ppap ppcc pppa pppp ppta pptt ptab ptal ptbl ptca ptcc ptcl pttc taa- taal taat taba tabb tabc tabl taca tacc tacl tact tala talc tall tapa tapp tapt tata tatb tatt tbca tbcb tbcc tbta tbtp tcap tcca tccc tcpa tctc tlac tlpa tpac tpap tpcp tppa tppp tptp ttab ttbb ttcp tttt