-ic a-a a-b a-c a-i a-t aaa aab aac aaf aai aao aas aat ab- aba abb abc abf abi abo abs abt ac- aca acb acc acf aci aco acs act af- afa afb afc aff afi afo afs aft ai- aia aib aic aif aii aio ais ait aoa aob aoc aof aoi aoo aos aot as- asa asb asc asf asi aso ass ast at- ata atb atc atf ati ato ats att baa bab bac baf bai bao bas bat bba bbb bbc bbf bbi bbo bbs bbt bca bcb bcc bcf bci bco bcs bct bfa bfb bfc bff bfi bfo bfs bft bi- bia bib bic bif bii bio bis bit boa bob boc bof boi boo bos bot bsa bsb bsc bsf bsi bso bss bst bta btb btc btf bti bto bts btt c-- caa cab cac caf cai cao cas cat cba cbb cbc cbf cbi cbo cbs cbt cca ccb ccc ccf cci cco ccs cct cfa cfb cfc cff cfi cfo cfs cft ci- cia cib cic cif cii cio cis cit co- coa cob coc cof coi coo cos cot csa csb csc csf csi cso css cst cta ctb ctc ctf cti cto cts ctt faa fab fac faf fai fao fas fat fba fbb fbc fbf fbi fbo fbs fbt fca fcb fcc fcf fci fco fcs fct ffa ffc fff ffi ffo ffs fft fia fib fic fif fii fis fit foa fob foc fof foi foo fos fot fsa fsb fsc fsf fsi fso fss fst fta ftb ftc ftf fti fto fts ftt i-f ia- iaa iab iac iaf iai iao ias iat iba ibb ibc ibf ibi ibo ibs ibt ica icb icc icf ici ico ics ict ifa ifb ifc iff ifi ifo ifs ift iia iib iic iif iii iio iis iit io- ioa iob ioc iof ioi ioo ios iot is- isa isb isc isf isi iso iss ist ita itb itc itf iti ito its itt o-i oaa oab oac oaf oai oao oas oat ob- oba obb obc obf obi obo obs obt oc- oca ocb occ ocf oci oco ocs oct of- ofa ofb ofc off ofi ofo ofs oft oia oib oic oif oii oio ois oit oo- ooa oob ooc oof ooi ooo oos oot os- osa osb osc osf osi oso oss ost ot- ota otb otc otf oti oto ots ott saa sab sac saf sai sao sas sat sba sbb sbc sbf sbi sbo sbs sbt sca scb scc scf sci sco scs sct sfa sfb sfc sff sfi sfo sfs sft sia sib sic sif sii sio sis sit soa sob soc sof soi soo sos sot ss- ssa ssb ssc ssf ssi sso sss sst sta stb stc stf sti sto sts stt taa tab tac taf tai tao tas tat tba tbb tbc tbf tbi tbo tbs tbt tca tcb tcc tcf tci tco tcs tct tfa tfb tfc tff tfi tfo tfs tft tia tib tic tif tii tio tis tit to- toa tob toc tof toi too tos tot tsa tsb tsc tsf tsi tso tss tst tta ttb ttc ttf tti tto tts ttt