-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aai aak aao aap aar aas aat ab- aba abb abc abe abi abk abo abp abr abs abt ac- aca acb acc ace aci ack aco acp acr acs act aea aeb aec aee aei aek aeo aep aer aes aet ai- aia aib aic aie aii aik aio aip air ais ait aka akb akc ake aki akk ako akp akr aks aoa aob aoc aoe aoi aok aoo aop aor aos aot ap- apa apb apc ape api apk apo app apr aps apt ar- ara arb arc are ari ark aro arp arr ars art as- asa asb asc ase asi ask aso asp asr ass ast at- ata atb atc ate ati ato atp atr ats att b-p baa bab bac bae bai bak bao bap bar bas bat bba bbb bbc bbe bbi bbk bbo bbp bbr bbs bbt bca bcb bcc bce bci bck bco bcp bcr bcs bct be- bea beb bec bee bei bek beo bep ber bes bet bi- bia bib bic bie bii bik bio bip bir bis bit bka bkb bkc bke bkk bko bkp bkr bks bkt boa bob boc boe boi bok boo bop bor bos bot bpa bpb bpc bpe bpi bpo bpp bpr bps bpt bra brb bre bri brk bro brp brr brs brt bsa bsb bsc bse bsi bsk bso bsp bsr bss bst bta btb btc bte bti btk bto btp btr bts btt c-- caa cab cac cae cai cak cao cap car cas cat cba cbb cbc cbe cbi cbk cbo cbp cbr cbs cbt cca ccb ccc cce cci cck cco ccp ccr ccs cct ce- cea ceb cec cee cei cek ceo cep cer ces cet ci- cia cib cic cie cii cik cio cip cir cis cit cka ckb ckc cki cko cks ckt co- coa cob coc coe coi cok coo cop cor cos cot cpa cpb cpc cpe cpi cpk cpo cpp cpr cps cpt cra crb crc cre cri crk cro crp crr crs crt csa csb csc cse csi csk cso csp csr css cst cta ctb ctc cte cti ctk cto ctp ctr cts ctt eaa eab eac eae eai eak eao eap ear eas eat eba ebb ebc ebe ebi ebk ebo ebp ebr ebs ebt ec- eca ecb ecc ece eci eck eco ecr ecs ect eea eeb eec eee eek eeo eep eer ees eet eia eib eic eie eii eik eio eip eir eis eit eka ekb ekc eke eki eko ekp ekr eks ekt eo- eoa eob eoc eoe eoi eok eoo eop eor eos eot ep- epa epb epc epe epi epo epp epr eps ept era erb erc ere eri erk ero erp err ers ert es- esa esb esc ese esi esk eso esp esr ess est eta etb etc ete eti etk eto etp etr ets ett ia- iaa iab iac iae iai iao iap iar ias iat iba ibb ibc ibe ibi ibk ibo ibp ibr ibs ibt ica icb icc ice ici ick ico icp icr ics ict ie- iea iec iee iei iek iep ier ies iet iia iib iic iie iii iio iip iir iis iit ika ikb ikc ike iki ikk iko ikr iks ikt io- ioa iob ioc ioe ioi ioo iop ior ios iot ipa ipb ipc ipe ipi ipo ipp ipr ips ipt ir- ira irb irc ire iri irk iro irp irr irs irt is- isa isb isc ise isi isk iso isp isr iss ist ita itb itc ite iti itk ito itp its itt k-t ka- kaa kab kac kae kai kak kao kap kar kas kat kba kbb kbc kbe kbi kbk kbo kbp kbr kbs kca kcb kcc kce kci kck kcp kcr kcs kct ke- kea keb kec kee kei kek keo kep ker kes ket kia kib kic kie kii kik kio kip kir kis kit kkb kkc kke kki kkk kkp kkr kks kkt koa kob koc koe koi kok koo kop kor kos kot kpa kpc kpe kpi kpk kpo kpp kpr kps kpt kra krc kri krk kro krp krr krs krt ksa ksb ksc kse ksi ksk kso ksp ksr kss kst kta ktb ktc kte ktk kto ktp ktr kts ktt o-i oaa oab oac oae oai oak oao oap oar oas oat ob- oba obb obc obe obi obk obo obp obr obs obt oc- oca ocb occ oci ock oco ocp ocr ocs oct oea oeb oec oee oei oeo oep oer oes oet oia oib oic oie oii oik oio oip oir ois oit oka okb okc oke oki okk oko okp okr oks oo- ooa oob ooc ooi ook ooo oop oor oos oot op- opa opb opc ope opi opk opo opp opr ops opt or- ora orb orc ore ori ork oro orp orr ors ort os- osa osb osc ose osi osk oso osp osr oss ost ot- ota otb otc ote oti otk oto otp otr ots ott p-p paa pab pac pae pai pak pao pap par pas pat pba pbb pbc pbe pbi pbk pbo pbp pbr pbs pbt pca pcb pcc pce pci pck pco pcp pcr pcs pct pea peb pec pee pei pek peo pep per pes pet pia pib pic pie pii pik pio pip pir pis pit pka pkb pkc pke pki pko pkp pkr pks pkt poa pob poc poe poi pok poo pop por pos pot ppa ppb ppc ppe ppi ppk ppo ppp ppr pps ppt pra prb prc pre pri prk pro prp prr prs prt ps- psa psb psc pse psi psk pso psp psr pss pst pt- pta ptb ptc pte pti ptk pto ptp ptr pts ptt ra- raa rab rac rae rai rak rao rap rar ras rat rba rbb rbc rbe rbi rbk rbo rbp rbr rbs