-ic a-a a-b a-c a-i a-t aaa aab aac aaf aai aan aao aar aat ab- aba abb abc abf abi abn abo abr abt ac- aca acb acc acf aci acn aco acr act af- afa afb afc aff afi afn afo afr aft ai- aia aib aic aif aii ain aio air ait an- ana anb anc anf ani ann ano anr ant aoa aob aoc aof aoi aon aoo aor aot ar- ara arb arc arf ari arn aro arr art at- ata atb atc atf ati atn ato atr att baa bab bac baf bai ban bao bar bat bba bbb bbc bbf bbi bbn bbo bbr bbt bca bcb bcc bcf bci bcn bco bcr bct bfa bfb bfc bff bfi bfn bfo bfr bft bi- bia bib bic bif bii bin bio bir bit bna bnb bnc bnf bni bnn bno bnr bnt boa bob boc bof boi bon boo bor bot bra brb brf bri brn bro brr brt bta btb btc btf bti btn bto btr btt c-- caa cab cac caf cai can cao car cat cba cbb cbc cbf cbi cbn cbo cbr cbt cca ccb ccc ccf cci ccn cco ccr cct cfa cfb cfc cff cfi cfn cfo cfr cft ci- cia cib cic cif cii cin cio cir cit cn- cna cnb cnc cnf cni cnn cno cnr cnt co- coa cob coc cof coi con coo cor cot cra crb crc crf cri crn cro crr crt cta ctb ctc ctf cti ctn cto ctr ctt faa fab fac faf fai fan fao far fat fba fbb fbc fbf fbi fbn fbo fbr fbt fca fcb fcc fcf fci fcn fco fcr fct ffa ffc fff ffi ffn ffo ffr fft fia fib fic fif fii fin fir fit fna fnb fnc fnf fni fnn fnr fnt foa fob foc fof foi fon foo for fot fra frb frc frf fri frn fro frr frt fta ftb ftc ftf fti ftn fto ftr ftt i-f ia- iaa iab iac iaf iai ian iao iar iat iba ibb ibc ibf ibi ibn ibo ibr ibt ica icb icc icf ici icn ico icr ict ifa ifb ifc iff ifi ifn ifo ifr ift iia iib iic iif iii iin iio iir iit in- ina inb inc inf ini inn ino inr int io- ioa iob ioc iof ioi ion ioo ior iot ir- ira irb irc irf iri irn iro irr irt ita itb itc itf iti itn ito itt n-i naa nab nac naf nai nan nao nar nat nba nbb nbc nbf nbi nbn nbo nbr nbt nca ncb ncc ncf nci ncn nco ncr nct nfa nfb nfc nff nfi nfn nfo nfr nft nia nib nic nif nii nin nio nir nit nna nnb nnc nnf nni nnn nno nnt no- noa nob noc nof noi non noo nor not nra nrb nrc nrf nri nrn nro nrr nrt nta ntb ntc ntf nti ntn nto ntr ntt o-i oaa oab oac oaf oai oan oao oar oat ob- oba obb obc obf obi obn obo obr obt oc- oca ocb occ ocf oci ocn oco ocr oct of- ofa ofb ofc off ofi ofn ofo ofr oft oia oib oic oif oii oin oio oir oit on- ona onb onc onf oni onn ono onr ont oo- ooa oob ooc oof ooi oon ooo oor oot or- ora orb orc orf ori orn oro orr ort ot- ota otb otc otf oti otn oto otr ott ra- raa rab rac raf rai ran rao rar rat rba rbb rbc rbf rbi rbn rbo rbr rbt rca rcb rcc rcf rci rcn rco rcr rct rfa rfb rfc rff rfi rfn rfo rfr rft ria rib ric rif rii rin rio rir rit rna rnb rnc rni rnn rno rnr rnt roa rob roc rof roi ron roo ror rot rra rrb rrc rrf rri rrn rrr rrt rta rtb rtc rtf rti rtn rto rtr rtt taa tab tac taf tai tan tao tar tat tba tbb tbc tbf tbi tbn tbo tbr tbt tca tcb tcc tcf tci tcn tco tcr tct tfa tfb tfc tff tfi tfn tfo tfr tft tia tib tic tif tii tin tio tir tit tna tnb tnc tnf tni tnn tno tnr tnt to- toa tob toc tof toi ton too tor tot tra trb trc trf tri trn tro trr trt tta ttb ttc ttf tti ttn tto ttr ttt