-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aai aak aao aap aar aat ab- aba abb abc abe abi abk abo abp abr abt ac- aca acb acc ace aci ack aco acp acr act aea aeb aec aee aei aek aeo aep aer aet ai- aia aib aic aie aii aik aio aip air ait aka akb akc ake aki akk ako akp akr aoa aob aoc aoe aoi aok aoo aop aor aot ap- apa apb apc ape api apk apo app apr apt ar- ara arb arc are ari ark aro arp arr art at- ata atb atc ate ati ato atp atr att b-p baa bab bac bae bai bak bao bap bar bat bba bbb bbc bbe bbi bbk bbo bbp bbr bbt bca bcb bcc bce bci bck bco bcp bcr bct be- bea beb bec bee bei bek beo bep ber bet bi- bia bib bic bie bii bik bio bip bir bit bka bkb bkc bke bkk bko bkp bkr bkt boa bob boc boe boi bok boo bop bor bot bpa bpb bpc bpe bpi bpo bpp bpr bpt bra brb bre bri brk bro brp brr brt bta btb btc bte bti btk bto btp btr btt c-- caa cab cac cae cai cak cao cap car cat cba cbb cbc cbe cbi cbk cbo cbp cbr cbt cca ccb ccc cce cci cck cco ccp ccr cct ce- cea ceb cec cee cei cek ceo cep cer cet ci- cia cib cic cie cii cik cio cip cir cit cka ckb ckc cki cko ckt co- coa cob coc coe coi cok coo cop cor cot cpa cpb cpc cpe cpi cpk cpo cpp cpr cpt cra crb crc cre cri crk cro crp crr crt cta ctb ctc cte cti ctk cto ctp ctr ctt eaa eab eac eae eai eak eao eap ear eat eba ebb ebc ebe ebi ebk ebo ebp ebr ebt ec- eca ecb ecc ece eci eck eco ecr ect eea eeb eec eee eek eeo eep eer eet eia eib eic eie eii eik eio eip eir eit eka ekb ekc eke eki eko ekp ekr ekt eo- eoa eob eoc eoe eoi eok eoo eop eor eot ep- epa epb epc epe epi epo epp epr ept era erb erc ere eri erk ero erp err ert eta etb etc ete eti etk eto etp etr ett ia- iaa iab iac iae iai iao iap iar iat iba ibb ibc ibe ibi ibk ibo ibp ibr ibt ica icb icc ice ici ick ico icp icr ict ie- iea iec iee iei iek iep ier iet iia iib iic iie iii iio iip iir iit ika ikb ikc ike iki ikk iko ikr ikt io- ioa iob ioc ioe ioi ioo iop ior iot ipa ipb ipc ipe ipi ipo ipp ipr ipt ir- ira irb irc ire iri irk iro irp irr irt ita itb itc ite iti itk ito itp itt k-t ka- kaa kab kac kae kai kak kao kap kar kat kba kbb kbc kbe kbi kbk kbo kbp kbr kca kcb kcc kce kci kck kcp kcr kct ke- kea keb kec kee kei kek keo kep ker ket kia kib kic kie kii kik kio kip kir kit kkb kkc kke kki kkk kkp kkr kkt koa kob koc koe koi kok koo kop kor kot kpa kpc kpe kpi kpk kpo kpp kpr kpt kra krc kri krk kro krp krr krt kta ktb ktc kte ktk kto ktp ktr ktt o-i oaa oab oac oae oai oak oao oap oar oat ob- oba obb obc obe obi obk obo obp obr obt oc- oca ocb occ oci ock oco ocp ocr oct oea oeb oec oee oei oeo oep oer oet oia oib oic oie oii oik oio oip oir oit oka okb okc oke oki okk oko okp okr oo- ooa oob ooc ooi ook ooo oop oor oot op- opa opb opc ope opi opk opo opp opr opt or- ora orb orc ore ori ork oro orp orr ort ot- ota otb otc ote oti otk oto otp otr ott p-p paa pab pac pae pai pak pao pap par pat pba pbb pbc pbe pbi pbk pbo pbp pbr pbt pca pcb pcc pce pci pck pco pcp pcr pct pea peb pec pee pei pek peo pep per pet pia pib pic pie pii pik pio pip pir pit pka pkb pkc pke pki pko pkp pkr pkt poa pob poc poe poi pok poo pop por pot ppa ppb ppc ppe ppi ppk ppo ppp ppr ppt pra prb prc pre pri prk pro prp prr prt pt- pta ptb ptc pte pti ptk pto ptp ptr ptt ra- raa rab rac rae rai rak rao rap rar rat rba rbb rbc rbe rbi rbk rbo rbp rbr rbt rca rcb rcc rce rci rco rcp rcr rct re- rea reb rec ree rei rek reo rep rer ret ria rib ric rie rii rik rio rip rir rit rkb rkc rke rkk rko rkp rkt roa rob roc roe roi rok roo rop ror rot rpa rpb rpc rpe rpi rpk rpo rpp rpr rpt rra rrb rrc rri rrk rrp rrr rrt rta rtb rtc rte rti rtk rto rtp rtr rtt taa tab tac tae tai tak tao tap tar tat tba tbb tbc tbe tbi tbk tbo tbp tbr tbt tca tcb tcc tce tci tck tco tcp tcr tct te- tea teb tec tee tei tek teo tep ter tet tia tib tic tie tii tik tio tip tir tit tka tkb tkc tke tkk tko tkp tkr tkt to- toa tob toc toe toi tok too top tor tot tpa tpb tpc tpe tpi tpk tpo tpp tpr tpt tra trb trc tre tri trk tro trp trr trt tta ttb ttc tte tti ttk tto ttp