-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aai aao aap aar aas aat ab- aba abb abc abe abi abo abp abr abs abt ac- aca acb acc ace aci aco acp acr acs act aea aeb aec aee aei aeo aep aer aes aet ai- aia aib aic aie aii aio aip air ais ait aoa aob aoc aoe aoi aoo aop aor aos aot ap- apa apb apc ape api apo app apr aps apt ar- ara arb arc are ari aro arp arr ars art as- asa asb asc ase asi aso asp asr ass ast at- ata atb atc ate ati ato atp atr ats att b-p baa bab bac bae bai bao bap bar bas bat bba bbb bbc bbe bbi bbo bbp bbr bbs bbt bca bcb bcc bce bci bco bcp bcr bcs bct be- bea beb bec bee bei beo bep ber bes bet bi- bia bib bic bie bii bio bip bir bis bit boa bob boc boe boi boo bop bor bos bot bpa bpb bpc bpe bpi bpo bpp bpr bps bpt bra brb bre bri bro brp brr brs brt bsa bsb bsc bse bsi bso bsp bsr bss bst bta btb btc bte bti bto btp btr bts btt c-- caa cab cac cae cai cao cap car cas cat cba cbb cbc cbe cbi cbo cbp cbr cbs cbt cca ccb ccc cce cci cco ccp ccr ccs cct ce- cea ceb cec cee cei ceo cep cer ces cet ci- cia cib cic cie cii cio cip cir cis cit co- coa cob coc coe coi coo cop cor cos cot cpa cpb cpc cpe cpi cpo cpp cpr cps cpt cra crb crc cre cri cro crp crr crs crt csa csb csc cse csi cso csp csr css cst cta ctb ctc cte cti cto ctp ctr cts ctt eaa eab eac eae eai eao eap ear eas eat eba ebb ebc ebe ebi ebo ebp ebr ebs ebt ec- eca ecb ecc ece eci eco ecr ecs ect eea eeb eec eee eeo eep eer ees eet eia eib eic eie eii eio eip eir eis eit eo- eoa eob eoc eoe eoi eoo eop eor eos eot ep- epa epb epc epe epi epo epp epr eps ept era erb erc ere eri ero erp err ers ert es- esa esb esc ese esi eso esp esr ess est eta etb etc ete eti eto etp etr ets ett ia- iaa iab iac iae iai iao iap iar ias iat iba ibb ibc ibe ibi ibo ibp ibr ibs ibt ica icb icc ice ici ico icp icr ics ict ie- iea iec iee iei iep ier ies iet iia iib iic iie iii iio iip iir iis iit 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 iro irp irr irs irt is- isa isb isc ise isi iso isp isr iss ist ita itb itc ite iti ito itp its itt o-i oaa oab oac oae oai oao oap oar oas oat ob- oba obb obc obe obi obo obp obr obs obt oc- oca ocb occ oci oco ocp ocr ocs oct oea oeb oec oee oei oeo oep oer oes oet oia oib oic oie oii oio oip oir ois oit oo- ooa oob ooc ooi ooo oop oor oos oot op- opa opb opc ope opi opo opp opr ops opt or- ora orb orc ore ori oro orp orr ors ort os- osa osb osc ose osi oso osp osr oss ost ot- ota otb otc ote oti oto otp otr ots ott p-p paa pab pac pae pai pao pap par pas pat pba pbb pbc pbe pbi pbo pbp pbr pbs pbt pca pcb pcc pce pci pco pcp pcr pcs pct pea peb pec pee pei peo pep per pes pet pia pib pic pie pii pio pip pir pis pit poa pob poc poe poi poo pop por pos pot ppa ppb ppc ppe ppi ppo ppp ppr pps ppt pra prb prc pre pri pro prp prr prs prt ps- psa psb psc pse psi pso psp psr pss pst pt- pta ptb ptc pte pti pto ptp ptr pts ptt ra- raa rab rac rae rai rao rap rar ras rat rba rbb rbc rbe rbi rbo rbp rbr rbs rbt rca rcb rcc rce rci rco rcp rcr rcs rct re- rea reb rec ree rei reo rep rer res ret ria rib ric rie rii rio rip rir ris rit roa rob roc roe roi roo rop ror ros rot rpa rpb rpc rpe rpi rpo rpp rpr rps rpt rra rrb rrc rri rrp rrr rrs rrt rsa rsb rsc rse rsi rso rsp rsr rss rst rta rtb rtc rte rti rto rtp rtr rts rtt saa sab sac sae sai sao sap sar sas sat sba sbb sbc sbe sbi sbo sbp sbr sbs sbt sca scb scc sce sci sco scp scr scs sct se- sea seb sec see sei seo sep ser ses set sia sib sic sie sii sio sip sir sis sit soa sob soc soe soi soo sop sor sos sot spa spb spc spe spi spo spp spr sps spt sr- sra srb src sre sri sro srp srr srs srt ss- ssa ssb ssc sse ssi sso ssp ssr sss sst sta stb stc ste sti sto stp str sts stt taa tab tac tae tai tao tap tar tas tat tba tbb tbc tbe tbi tbo tbp tbr tbs tbt tca tcb tcc tce tci tco tcp tcr tcs tct te- tea teb tec tee tei teo tep ter tes tet tia tib tic tie tii tio tip tir tis tit to- toa tob toc toe toi too top tor tos tot tpa tpb