-ic a-a a-b a-c a-i a-t aaa aab aac aai aan aao aar aat ab- aba abb abc abi abn abo abr abt ac- aca acb acc aci acn aco acr act ai- aia aib aic aii ain aio air ait an- ana anb anc ani ann ano anr ant aoa aob aoc aoi aon aoo aor aot ar- ara arb arc ari arn aro arr art at- ata atb atc ati atn ato atr att baa bab bac bai ban bao bar bat bba bbb bbc bbi bbn bbo bbr bbt bca bcb bcc bci bcn bco bcr bct bi- bia bib bic bii bin bio bir bit bna bnb bnc bni bnn bno bnr bnt boa bob boc boi bon boo bor bot bra brb bri brn bro brr brt bta btb btc bti btn bto btr btt c-- caa cab cac cai can cao car cat cba cbb cbc cbi cbn cbo cbr cbt cca ccb ccc cci ccn cco ccr cct ci- cia cib cic cii cin cio cir cit cn- cna cnb cnc cni cnn cno cnr cnt co- coa cob coc coi con coo cor cot cra crb crc cri crn cro crr crt cta ctb ctc cti ctn cto ctr ctt ia- iaa iab iac iai ian iao iar iat iba ibb ibc ibi ibn ibo ibr ibt ica icb icc ici icn ico icr ict iia iib iic iii iin iio iir iit in- ina inb inc ini inn ino inr int io- ioa iob ioc ioi ion ioo ior iot ir- ira irb irc iri irn iro irr irt ita itb itc iti itn ito itt n-i naa nab nac nai nan nao nar nat nba nbb nbc nbi nbn nbo nbr nbt nca ncb ncc nci ncn nco ncr nct nia nib nic nii nin nio nir nit nna nnb nnc nni nnn nno nnt no- noa nob noc noi non noo nor not nra nrb nrc nri nrn nro nrr nrt nta ntb ntc nti ntn nto ntr ntt o-i oaa oab oac oai oan oao oar oat ob- oba obb obc obi obn obo obr obt oc- oca ocb occ oci ocn oco ocr oct oia oib oic oii oin oio oir oit on- ona onb onc oni onn ono onr ont oo- ooa oob ooc ooi oon ooo oor oot or- ora orb orc ori orn oro orr ort ot- ota otb otc oti otn oto otr ott ra- raa rab rac rai ran rao rar rat rba rbb rbc rbi rbn rbo rbr rbt rca rcb rcc rci rcn rco rcr rct ria rib ric rii rin rio rir rit rna rnb rnc rni rnn rno rnr rnt roa rob roc roi ron roo ror rot rra rrb rrc rri rrn rrr rrt rta rtb rtc rti rtn rto rtr rtt taa tab tac tai tan tao tar tat tba tbb tbc tbi tbn tbo tbr tbt tca tcb tcc tci tcn tco tcr tct tia tib tic tii tin tio tir tit tna tnb tnc tni tnn tno tnr tnt to- toa tob toc toi ton too tor tot tra trb trc tri trn tro trr trt tta ttb ttc tti ttn tto ttr ttt