-ic a-a a-b a-c a-i a-t aaa aab aac aai aan aao aar aas aat ab- aba abb abc abi abn abo abr abs abt ac- aca acb acc aci acn aco acr acs act ai- aia aib aic aii ain aio air ais ait an- ana anb anc ani ann ano anr ans ant aoa aob aoc aoi aon aoo aor aos aot ar- ara arb arc ari arn aro arr ars art as- asa asb asc asi asn aso asr ass ast at- ata atb atc ati atn ato atr ats att baa bab bac bai ban bao bar bas bat bba bbb bbc bbi bbn bbo bbr bbs bbt bca bcb bcc bci bcn bco bcr bcs bct bi- bia bib bic bii bin bio bir bis bit bna bnb bnc bni bnn bno bnr bns bnt boa bob boc boi bon boo bor bos bot bra brb bri brn bro brr brs brt bsa bsb bsc bsi bsn bso bsr bss bst bta btb btc bti btn bto btr bts btt c-- caa cab cac cai can cao car cas cat cba cbb cbc cbi cbn cbo cbr cbs cbt cca ccb ccc cci ccn cco ccr ccs cct ci- cia cib cic cii cin cio cir cis cit cn- cna cnb cnc cni cnn cno cnr cns cnt co- coa cob coc coi con coo cor cos cot cra crb crc cri crn cro crr crs crt csa csb csc csi csn cso csr css cst cta ctb ctc cti ctn cto ctr cts ctt ia- iaa iab iac iai ian iao iar ias iat iba ibb ibc ibi ibn ibo ibr ibs ibt ica icb icc ici icn ico icr ics ict iia iib iic iii iin iio iir iis iit in- ina inb inc ini inn ino inr ins int io- ioa iob ioc ioi ion ioo ior ios iot ir- ira irb irc iri irn iro irr irs irt is- isa isb isc isi isn iso isr iss ist ita itb itc iti itn ito its itt n-i naa nab nac nai nan nao nar nas nat nba nbb nbc nbi nbn nbo nbr nbs nbt nca ncb ncc nci ncn nco ncr ncs nct nia nib nic nii nin nio nir nis nit nna nnb nnc nni nnn nno nns nnt no- noa nob noc noi non noo nor nos not nra nrb nrc nri nrn nro nrr nrs nrt nsa nsb nsc nsi nsn nso nsr nss nst nta ntb ntc nti ntn nto ntr nts ntt o-i oaa oab oac oai oan oao oar oas oat ob- oba obb obc obi obn obo obr obs obt oc- oca ocb occ oci ocn oco ocr ocs oct oia oib oic oii oin oio oir ois oit on- ona onb onc oni onn ono onr ons ont oo- ooa oob ooc ooi oon ooo oor oos oot or- ora orb orc ori orn oro orr ors ort os- osa osb osc osi osn oso osr oss ost ot- ota otb otc oti otn oto otr ots ott ra- raa rab rac rai ran rao rar ras rat rba rbb rbc rbi rbn rbo rbr rbs rbt rca rcb rcc rci rcn rco rcr rcs rct ria rib ric rii rin rio rir ris rit rna rnb rnc rni rnn rno rnr rns rnt roa rob roc roi ron roo ror ros rot rra rrb rrc rri rrn rrr rrs rrt rsa rsb rsc rsi rsn rso rsr rss rst rta rtb rtc rti rtn rto rtr rts rtt saa sab sac sai san sao sar sas sat sba sbb sbc sbi sbn sbo sbr sbs sbt sca scb scc sci scn sco scr scs sct sia sib sic sii sin sio sir sis sit sna snb snc sni snn sno snr sns snt soa sob soc soi son soo sor sos sot sr- sra srb src sri srn sro srr srs srt ss- ssa ssb ssc ssi ssn sso ssr sss sst sta stb stc sti stn sto str sts stt taa tab tac tai tan tao tar tas tat tba tbb tbc tbi tbn tbo tbr tbs tbt tca tcb tcc tci tcn tco tcr tcs tct tia tib tic tii tin tio tir tis tit tna tnb tnc tni tnn tno tnr tns tnt to- toa tob toc toi ton too tor tos tot tra trb trc tri trn tro trr trs trt tsa tsb tsc tsi tsn tso tsr tss tst tta ttb ttc tti ttn tto ttr tts ttt