-ic a-a a-b a-c a-i a-t aaa aab aac aai aao aap aar aat ab- aba abb abc abi abo abp abr abt ac- aca acb acc aci aco acp acr act ai- aia aib aic aii aio aip air ait aoa aob aoc aoi aoo aop aor aot ap- apa apb apc api apo app apr apt ar- ara arb arc ari aro arp arr art at- ata atb atc ati ato atp atr att b-p baa bab bac bai bao bap bar bat bba bbb bbc bbi bbo bbp bbr bbt bca bcb bcc bci bco bcp bcr bct bi- bia bib bic bii bio bip bir bit boa bob boc boi boo bop bor bot bpa bpb bpc bpi bpo bpp bpr bpt bra brb bri bro brp brr brt bta btb btc bti bto btp btr btt c-- caa cab cac cai cao cap car cat cba cbb cbc cbi cbo cbp cbr cbt cca ccb ccc cci cco ccp ccr cct ci- cia cib cic cii cio cip cir cit co- coa cob coc coi coo cop cor cot cpa cpb cpc cpi cpo cpp cpr cpt cra crb crc cri cro crp crr crt cta ctb ctc cti cto ctp ctr ctt ia- iaa iab iac iai iao iap iar iat iba ibb ibc ibi ibo ibp ibr ibt ica icb icc ici ico icp icr ict iia iib iic iii iio iip iir iit io- ioa iob ioc ioi ioo iop ior iot ipa ipb ipc ipi ipo ipp ipr ipt ir- ira irb irc iri iro irp irr irt ita itb itc iti ito itp itt o-i oaa oab oac oai oao oap oar oat ob- oba obb obc obi obo obp obr obt oc- oca ocb occ oci oco ocp ocr oct oia oib oic oii oio oip oir oit oo- ooa oob ooc ooi ooo oop oor oot op- opa opb opc opi opo opp opr opt or- ora orb orc ori oro orp orr ort ot- ota otb otc oti oto otp otr ott p-p paa pab pac pai pao pap par pat pba pbb pbc pbi pbo pbp pbr pbt pca pcb pcc pci pco pcp pcr pct pia pib pic pii pio pip pir pit poa pob poc poi poo pop por pot ppa ppb ppc ppi ppo ppp ppr ppt pra prb prc pri pro prp prr prt pt- pta ptb ptc pti pto ptp ptr ptt ra- raa rab rac rai rao rap rar rat rba rbb rbc rbi rbo rbp rbr rbt rca rcb rcc rci rco rcp rcr rct ria rib ric rii rio rip rir rit roa rob roc roi roo rop ror rot rpa rpb rpc rpi rpo rpp rpr rpt rra rrb rrc rri rrp rrr rrt rta rtb rtc rti rto rtp rtr rtt taa tab tac tai tao tap tar tat tba tbb tbc tbi tbo tbp tbr tbt tca tcb tcc tci tco tcp tcr tct tia tib tic tii tio tip tir tit to- toa tob toc toi too top tor tot tpa tpb tpc tpi tpo tpp tpr tpt tra trb trc tri tro trp trr trt tta ttb ttc tti tto ttp ttr ttt