-ic a-a a-b a-c a-i a-t aaa aab aac aai aan aao aas aat ab- aba abb abc abi abn abo abs abt ac- aca acb acc aci acn aco acs act ai- aia aib aic aii ain aio ais ait an- ana anb anc ani ann ano ans ant aoa aob aoc aoi aon aoo aos aot as- asa asb asc asi asn aso ass ast at- ata atb atc ati atn ato ats att baa bab bac bai ban bao bas bat bba bbb bbc bbi bbn bbo bbs bbt bca bcb bcc bci bcn bco bcs bct bi- bia bib bic bii bin bio bis bit bna bnb bnc bni bnn bno bns bnt boa bob boc boi bon boo bos bot bsa bsb bsc bsi bsn bso bss bst bta btb btc bti btn bto bts btt c-- caa cab cac cai can cao cas cat cba cbb cbc cbi cbn cbo cbs cbt cca ccb ccc cci ccn cco ccs cct ci- cia cib cic cii cin cio cis cit cn- cna cnb cnc cni cnn cno cns cnt co- coa cob coc coi con coo cos cot csa csb csc csi csn cso css cst cta ctb ctc cti ctn cto cts ctt ia- iaa iab iac iai ian iao ias iat iba ibb ibc ibi ibn ibo ibs ibt ica icb icc ici icn ico ics ict iia iib iic iii iin iio iis iit in- ina inb inc ini inn ino ins int io- ioa iob ioc ioi ion ioo ios iot is- isa isb isc isi isn iso iss ist ita itb itc iti itn ito its itt n-i naa nab nac nai nan nao nas nat nba nbb nbc nbi nbn nbo nbs nbt nca ncb ncc nci ncn nco ncs nct nia nib nic nii nin nio nis nit nna nnb nnc nni nnn nno nns nnt no- noa nob noc noi non noo nos not nsa nsb nsc nsi nsn nso nss nst nta ntb ntc nti ntn nto nts ntt o-i oaa oab oac oai oan oao oas oat ob- oba obb obc obi obn obo obs obt oc- oca ocb occ oci ocn oco ocs oct oia oib oic oii oin oio ois oit on- ona onb onc oni onn ono ons ont oo- ooa oob ooc ooi oon ooo oos oot os- osa osb osc osi osn oso oss ost ot- ota otb otc oti otn oto ots ott saa sab sac sai san sao sas sat sba sbb sbc sbi sbn sbo sbs sbt sca scb scc sci scn sco scs sct sia sib sic sii sin sio sis sit sna snb snc sni snn sno sns snt soa sob soc soi son soo sos sot ss- ssa ssb ssc ssi ssn sso sss sst sta stb stc sti stn sto sts stt taa tab tac tai tan tao tas tat tba tbb tbc tbi tbn tbo tbs tbt tca tcb tcc tci tcn tco tcs tct tia tib tic tii tin tio tis tit tna tnb tnc tni tnn tno tns tnt to- toa tob toc toi ton too tos tot tsa tsb tsc tsi tsn tso tss tst tta ttb ttc tti ttn tto tts ttt