-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aai aan aar aat ab- aba abb abc abe abi abn abr abt ac- aca acb acc ace aci acn acr act aea aeb aec aee aei aen aer aet ai- aia aib aic aie aii ain air ait an- ana anb anc ane ani ann anr ant ar- ara arb arc are ari arn arr art at- ata atb atc ate ati atn atr att baa bab bac bae bai ban bar bat bba bbb bbc bbe bbi bbn bbr bbt bca bcb bcc bce bci bcn bcr bct be- bea beb bec bee bei ben ber bet bi- bia bib bic bie bii bin bir bit bna bnb bnc bne bni bnn bnr bnt bra brb bre bri brn brr brt bta btb btc bte bti btn btr btt c-- caa cab cac cae cai can car cat cba cbb cbc cbe cbi cbn cbr cbt cca ccb ccc cce cci ccn ccr cct ce- cea ceb cec cee cei cen cer cet ci- cia cib cic cie cii cin cir cit cn- cna cnb cnc cne cni cnn cnr cnt cra crb crc cre cri crn crr crt cta ctb ctc cte cti ctn ctr ctt eaa eab eac eae eai ean ear eat eba ebb ebc ebe ebi ebn ebr ebt ec- eca ecb ecc ece eci ecn ecr ect eea eeb eec eee een eer eet eia eib eic eie eii ein eir eit en- ena enb enc ene eni enn enr ent era erb erc ere eri ern err ert eta etb etc ete eti etn etr ett ia- iaa iab iac iae iai ian iar iat iba ibb ibc ibe ibi ibn ibr ibt ica icb icc ice ici icn icr ict ie- iea iec iee iei ien ier iet iia iib iic iie iii iin iir iit in- ina inb inc ine ini inn inr int ir- ira irb irc ire iri irn irr irt ita itb itc ite iti itn itt n-i naa nab nac nae nai nan nar nat nba nbb nbc nbe nbi nbn nbr nbt nca ncb ncc nce nci ncn ncr nct ne- nea neb nec nee nei nen ner net nia nib nic nie nii nin nir nit nna nnb nnc nne nni nnn nnt nra nrb nrc nre nri nrn nrr nrt nta ntb ntc nte nti ntn ntr ntt ra- raa rab rac rae rai ran rar rat rba rbb rbc rbe rbi rbn rbr rbt rca rcb rcc rce rci rcn rcr rct re- rea reb rec ree rei ren rer ret ria rib ric rie rii rin rir rit rna rnb rnc rni rnn rnr rnt rra rrb rrc rri rrn rrr rrt rta rtb rtc rte rti rtn rtr rtt taa tab tac tae tai tan tar tat tba tbb tbc tbe tbi tbn tbr tbt tca tcb tcc tce tci tcn tcr tct te- tea teb tec tee tei ten ter tet tia tib tic tie tii tin tir tit tna tnb tnc tne tni tnn tnr tnt tra trb trc tre tri trn trr trt tta ttb ttc tte tti ttn ttr ttt