-ic a-a a-b a-c a-i a-t aaa aab aac aae aai aan aao aas aat ab- aba abb abc abe abi abn abo abs abt ac- aca acb acc ace aci acn aco acs act aea aeb aec aee aei aen aeo aes aet ai- aia aib aic aie aii ain aio ais ait an- ana anb anc ane ani ann ano ans ant aoa aob aoc aoe aoi aon aoo aos aot as- asa asb asc ase asi asn aso ass ast at- ata atb atc ate ati atn ato ats att baa bab bac bae bai ban bao bas bat bba bbb bbc bbe bbi bbn bbo bbs bbt bca bcb bcc bce bci bcn bco bcs bct be- bea beb bec bee bei ben beo bes bet bi- bia bib bic bie bii bin bio bis bit bna bnb bnc bne bni bnn bno bns bnt boa bob boc boe boi bon boo bos bot bsa bsb bsc bse bsi bsn bso bss bst bta btb btc bte bti btn bto bts btt c-- caa cab cac cae cai can cao cas cat cba cbb cbc cbe cbi cbn cbo cbs cbt cca ccb ccc cce cci ccn cco ccs cct ce- cea ceb cec cee cei cen ceo ces cet ci- cia cib cic cie cii cin cio cis cit cn- cna cnb cnc cne cni cnn cno cns cnt co- coa cob coc coe coi con coo cos cot csa csb csc cse csi csn cso css cst cta ctb ctc cte cti ctn cto cts ctt eaa eab eac eae eai ean eao eas eat eba ebb ebc ebe ebi ebn ebo ebs ebt ec- eca ecb ecc ece eci ecn eco ecs ect eea eeb eec eee een eeo ees eet eia eib eic eie eii ein eio eis eit en- ena enb enc ene eni enn eno ens ent eo- eoa eob eoc eoe eoi eon eoo eos eot es- esa esb esc ese esi esn eso ess est eta etb etc ete eti etn eto ets ett ia- iaa iab iac iae iai ian iao ias iat iba ibb ibc ibe ibi ibn ibo ibs ibt ica icb icc ice ici icn ico ics ict ie- iea iec iee iei ien ies iet iia iib iic iie iii iin iio iis iit in- ina inb inc ine ini inn ino ins int io- ioa iob ioc ioe ioi ion ioo ios iot is- isa isb isc ise isi isn iso iss ist ita itb itc ite iti itn ito its itt n-i naa nab nac nae nai nan nao nas nat nba nbb nbc nbe nbi nbn nbo nbs nbt nca ncb ncc nce nci ncn nco ncs nct ne- nea neb nec nee nei nen neo nes net nia nib nic nie nii nin nio nis nit nna nnb nnc nne nni nnn nno nns nnt no- noa nob noc noe noi non noo nos not nsa nsb nsc nse nsi nsn nso nss nst nta ntb ntc nte nti ntn nto nts ntt o-i oaa oab oac oae oai oan oao oas oat ob- oba obb obc obe obi obn obo obs obt oc- oca ocb occ oci ocn oco ocs oct oea oeb oec oee oei oen oeo oes oet oia oib oic oie oii oin oio ois oit on- ona onb onc one oni onn ono ons ont oo- ooa oob ooc ooi oon ooo oos oot os- osa osb osc ose osi osn oso oss ost ot- ota otb otc ote oti otn oto ots ott saa sab sac sae sai san sao sas sat sba sbb sbc sbe sbi sbn sbo sbs sbt sca scb scc sce sci scn sco scs sct se- sea seb sec see sei sen seo ses set sia sib sic sie sii sin sio sis sit sna snb snc sne sni snn sno sns snt soa sob soc soe soi son soo sos sot ss- ssa ssb ssc sse ssi ssn sso sss sst sta stb stc ste sti stn sto sts stt taa tab tac tae tai tan tao tas tat tba tbb tbc tbe tbi tbn tbo tbs tbt tca tcb tcc tce tci tcn tco tcs tct te- tea teb tec tee tei ten teo tes tet tia tib tic tie tii tin tio tis tit tna tnb tnc tne tni tnn tno tns tnt to- toa tob toc toe toi ton too tos tot tsa tsb tsc tse tsi tsn tso tss tst tta ttb ttc tte tti ttn tto tts ttt