-ic a-a a-b a-c a-i a-t aaa aab aac aai aao aap aas aat ab- aba abb abc abi abo abp abs abt ac- aca acb acc aci aco acp acs act ai- aia aib aic aii aio aip ais ait aoa aob aoc aoi aoo aop aos aot ap- apa apb apc api apo app aps apt as- asa asb asc asi aso asp ass ast at- ata atb atc ati ato atp ats att b-p baa bab bac bai bao bap bas bat bba bbb bbc bbi bbo bbp bbs bbt bca bcb bcc bci bco bcp bcs bct bi- bia bib bic bii bio bip bis bit boa bob boc boi boo bop bos bot bpa bpb bpc bpi bpo bpp bps bpt bsa bsb bsc bsi bso bsp bss bst bta btb btc bti bto btp bts btt c-- caa cab cac cai cao cap cas cat cba cbb cbc cbi cbo cbp cbs cbt cca ccb ccc cci cco ccp ccs cct ci- cia cib cic cii cio cip cis cit co- coa cob coc coi coo cop cos cot cpa cpb cpc cpi cpo cpp cps cpt csa csb csc csi cso csp css cst cta ctb ctc cti cto ctp cts ctt ia- iaa iab iac iai iao iap ias iat iba ibb ibc ibi ibo ibp ibs ibt ica icb icc ici ico icp ics ict iia iib iic iii iio iip iis iit io- ioa iob ioc ioi ioo iop ios iot ipa ipb ipc ipi ipo ipp ips ipt is- isa isb isc isi iso isp iss ist ita itb itc iti ito itp its itt o-i oaa oab oac oai oao oap oas oat ob- oba obb obc obi obo obp obs obt oc- oca ocb occ oci oco ocp ocs oct oia oib oic oii oio oip ois oit oo- ooa oob ooc ooi ooo oop oos oot op- opa opb opc opi opo opp ops opt os- osa osb osc osi oso osp oss ost ot- ota otb otc oti oto otp ots ott p-p paa pab pac pai pao pap pas pat pba pbb pbc pbi pbo pbp pbs pbt pca pcb pcc pci pco pcp pcs pct pia pib pic pii pio pip pis pit poa pob poc poi poo pop pos pot ppa ppb ppc ppi ppo ppp pps ppt ps- psa psb psc psi pso psp pss pst pt- pta ptb ptc pti pto ptp pts ptt saa sab sac sai sao sap sas sat sba sbb sbc sbi sbo sbp sbs sbt sca scb scc sci sco scp scs sct sia sib sic sii sio sip sis sit soa sob soc soi soo sop sos sot spa spb spc spi spo spp sps spt ss- ssa ssb ssc ssi sso ssp sss sst sta stb stc sti sto stp sts stt taa tab tac tai tao tap tas tat tba tbb tbc tbi tbo tbp tbs tbt tca tcb tcc tci tco tcp tcs tct tia tib tic tii tio tip tis tit to- toa tob toc toi too top tos tot tpa tpb tpc tpi tpo tpp tps tpt tsa tsb tsc tsi tso tsp tss tst tta ttb ttc tti tto ttp tts ttt