-ic a-a a-b a-c a-i a-t aaa aab aac aai aao aap aar aas aat ab- aba abb abc abi abo abp abr abs abt ac- aca acb acc aci aco acp acr acs act ai- aia aib aic aii aio aip air ais ait aoa aob aoc aoi aoo aop aor aos aot ap- apa apb apc api apo app apr aps apt ar- ara arb arc ari aro arp arr ars art as- asa asb asc asi aso asp asr ass ast at- ata atb atc ati ato atp atr ats att b-p baa bab bac bai bao bap bar bas bat bba bbb bbc bbi bbo bbp bbr bbs bbt bca bcb bcc bci bco bcp bcr bcs bct bi- bia bib bic bii bio bip bir bis bit boa bob boc boi boo bop bor bos bot bpa bpb bpc bpi bpo bpp bpr bps bpt bra brb bri bro brp brr brs brt bsa bsb bsc bsi bso bsp bsr bss bst bta btb btc bti bto btp btr bts btt c-- caa cab cac cai cao cap car cas cat cba cbb cbc cbi cbo cbp cbr cbs cbt cca ccb ccc cci cco ccp ccr ccs cct ci- cia cib cic cii cio cip cir cis cit co- coa cob coc coi coo cop cor cos cot cpa cpb cpc cpi cpo cpp cpr cps cpt cra crb crc cri cro crp crr crs crt csa csb csc csi cso csp csr css cst cta ctb ctc cti cto ctp ctr cts ctt ia- iaa iab iac iai iao iap iar ias iat iba ibb ibc ibi ibo ibp ibr ibs ibt ica icb icc ici ico icp icr ics ict iia iib iic iii iio iip iir iis iit io- ioa iob ioc ioi ioo iop ior ios iot ipa ipb ipc ipi ipo ipp ipr ips ipt ir- ira irb irc iri iro irp irr irs irt is- isa isb isc isi iso isp isr iss ist ita itb itc iti ito itp its itt o-i oaa oab oac oai oao oap oar oas oat ob- oba obb obc obi obo obp obr obs obt oc- oca ocb occ oci oco ocp ocr ocs oct oia oib oic oii oio oip oir ois oit oo- ooa oob ooc ooi ooo oop oor oos oot op- opa opb opc opi opo opp opr ops opt or- ora orb orc ori oro orp orr ors ort os- osa osb osc osi oso osp osr oss ost ot- ota otb otc oti oto otp otr ots ott p-p paa pab pac pai pao pap par pas pat pba pbb pbc pbi pbo pbp pbr pbs pbt pca pcb pcc pci pco pcp pcr pcs pct pia pib pic pii pio pip pir pis pit poa pob poc poi poo pop por pos pot ppa ppb ppc ppi ppo ppp ppr pps ppt pra prb prc pri pro prp prr prs prt ps- psa psb psc psi pso psp psr pss pst pt- pta ptb ptc pti pto ptp ptr pts ptt ra- raa rab rac rai rao rap rar ras rat rba rbb rbc rbi rbo rbp rbr rbs rbt rca rcb rcc rci rco rcp rcr rcs rct ria rib ric rii rio rip rir ris rit roa rob roc roi roo rop ror ros rot rpa rpb rpc rpi rpo rpp rpr rps rpt rra rrb rrc rri rrp rrr rrs rrt rsa rsb rsc rsi rso rsp rsr rss rst rta rtb rtc rti rto rtp rtr rts rtt saa sab sac sai sao sap sar sas sat sba sbb sbc sbi sbo sbp sbr sbs sbt sca scb scc sci sco scp scr scs sct sia sib sic sii sio sip sir sis sit soa sob soc soi soo sop sor sos sot spa spb spc spi spo spp spr sps spt sr- sra srb src sri sro srp srr srs srt ss- ssa ssb ssc ssi sso ssp ssr sss sst sta stb stc sti sto stp str sts stt taa tab tac tai tao tap tar tas tat tba tbb tbc tbi tbo tbp tbr tbs tbt tca tcb tcc tci tco tcp tcr tcs tct tia tib tic tii tio tip tir tis tit to- toa tob toc toi too top tor tos tot tpa tpb tpc tpi tpo tpp tpr tps tpt tra trb trc tri tro trp trr trs trt tsa tsb tsc tsi tso tsp tsr tss tst tta ttb ttc tti tto ttp ttr tts ttt