-ic a-a a-b a-c a-i a-t aaa aab aac aai aam aao aas aat ab- aba abb abc abi abm abo abs abt ac- aca acb acc aci acm aco acs act ai- aia aib aic aii aim aio ais ait ama amb amc ami amm amo ams amt aoa aob aoc aoi aom aoo aos aot as- asa asb asc asi asm aso ass ast at- ata atb atc ati atm ato ats att baa bab bac bai bam bao bas bat bba bbb bbc bbi bbm bbo bbs bbt bca bcb bcc bci bcm bco bcs bct bi- bia bib bic bii bim bio bis bit bma bmb bmc bmi bmm bmo bms bmt boa bob boc boi bom boo bos bot bsa bsb bsc bsi bsm bso bss bst bta btb btc bti btm bto bts btt c-- caa cab cac cai cam cao cas cat cba cbb cbc cbi cbm cbo cbs cbt cca ccb ccc cci ccm cco ccs cct ci- cia cib cic cii cim cio cis cit cma cmb cmc cmi cmm cmo cms cmt co- coa cob coc coi com coo cos cot csa csb csc csi csm cso css cst cta ctb ctc cti ctm cto cts ctt ia- iaa iab iac iai iam iao ias iat iba ibb ibc ibi ibm ibo ibs ibt ica icb icc ici icm ico ics ict iia iib iic iii iim iio iis iit im- ima imb imc imi imm imo ims imt io- ioa iob ioc ioi iom ioo ios iot is- isa isb isc isi ism iso iss ist ita itb itc iti itm ito its itt m-o maa mab mac mai mam mao mas mat mba mbb mbc mbi mbm mbo mbs mbt mc- mca mcb mcc mci mcm mco mcs mct mi- mia mib mic mii mim mio mis mit mma mmb mmc mmi mmm mmo mms mmt moa mob moc moi mom moo mos mot msa msb msc msi msm mso mss mst mta mtb mtc mti mtm mto mts mtt o-i oaa oab oac oai oam oao oas oat ob- oba obb obc obi obm obo obs obt oc- oca ocb occ oci ocm oco ocs oct oia oib oic oii oim oio ois oit om- oma omb omc omi omm omo oms omt oo- ooa oob ooc ooi oom ooo oos oot os- osa osb osc osi osm oso oss ost ot- ota otb otc oti otm oto ots ott saa sab sac sai sam sao sas sat sba sbb sbc sbi sbm sbo sbs sbt sca scb scc sci scm sco scs sct sia sib sic sii sim sio sis sit sma smb smc smi smm smo sms smt soa sob soc soi som soo sos sot ss- ssa ssb ssc ssi ssm sso sss sst sta stb stc sti stm sto sts stt taa tab tac tai tam tao tas tat tba tbb tbc tbi tbm tbo tbs tbt tca tcb tcc tci tcm tco tcs tct tia tib tic tii tim tio tis tit tma tmb tmc tmi tmm tmo tms tmt to- toa tob toc toi tom too tos tot tsa tsb tsc tsi tsm tso tss tst tta ttb ttc tti ttm tto tts ttt