-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aai aan aao aar aat ab- aba abb abc abe abi abn abo abr abt ac- aca acb acc ace aci acn aco acr act aea aeb aec aee aei aen aeo aer aet ai- aia aib aic aie aii ain aio air ait an- ana anb anc ane ani ann ano anr ant aoa aob aoc aoe aoi aon aoo aor aot ar- ara arb arc are ari arn aro arr art at- ata atb atc ate ati atn ato atr att baa bab bac bae bai ban bao bar bat bba bbb bbc bbe bbi bbn bbo bbr bbt bca bcb bcc bce bci bcn bco bcr bct be- bea beb bec bee bei ben beo ber bet bi- bia bib bic bie bii bin bio bir bit bna bnb bnc bne bni bnn bno bnr bnt boa bob boc boe boi bon boo bor bot bra brb bre bri brn bro brr brt bta btb btc bte bti btn bto btr btt c-- caa cab cac cae cai can cao car cat cba cbb cbc cbe cbi cbn cbo cbr cbt cca ccb ccc cce cci ccn cco ccr cct ce- cea ceb cec cee cei cen ceo cer cet ci- cia cib cic cie cii cin cio cir cit cn- cna cnb cnc cne cni cnn cno cnr cnt co- coa cob coc coe coi con coo cor cot cra crb crc cre cri crn cro crr crt cta ctb ctc cte cti ctn cto ctr ctt eaa eab eac eae eai ean eao ear eat eba ebb ebc ebe ebi ebn ebo ebr ebt ec- eca ecb ecc ece eci ecn eco ecr ect eea eeb eec eee een eeo eer eet eia eib eic eie eii ein eio eir eit en- ena enb enc ene eni enn eno enr ent eo- eoa eob eoc eoe eoi eon eoo eor eot era erb erc ere eri ern ero err ert eta etb etc ete eti etn eto etr ett ia- iaa iab iac iae iai ian iao iar iat iba ibb ibc ibe ibi ibn ibo ibr ibt ica icb icc ice ici icn ico icr ict ie- iea iec iee iei ien ier iet iia iib iic iie iii iin iio iir iit in- ina inb inc ine ini inn ino inr int io- ioa iob ioc ioe ioi ion ioo ior iot ir- ira irb irc ire iri irn iro irr irt ita itb itc ite iti itn ito itt n-i naa nab nac nae nai nan nao nar nat nba nbb nbc nbe nbi nbn nbo nbr nbt nca ncb ncc nce nci ncn nco ncr nct ne- nea neb nec nee nei nen neo ner net nia nib nic nie nii nin nio nir nit nna nnb nnc nne nni nnn nno nnt no- noa nob noc noe noi non noo nor not nra nrb nrc nre nri nrn nro nrr nrt nta ntb ntc nte nti ntn nto ntr ntt o-i oaa oab oac oae oai oan oao oar oat ob- oba obb obc obe obi obn obo obr obt oc- oca ocb occ oci ocn oco ocr oct oea oeb oec oee oei oen oeo oer oet oia oib oic oie oii oin oio oir oit on- ona onb onc one oni onn ono onr ont oo- ooa oob ooc ooi oon ooo oor oot or- ora orb orc ore ori orn oro orr ort ot- ota otb otc ote oti otn oto otr ott ra- raa rab rac rae rai ran rao rar rat rba rbb rbc rbe rbi rbn rbo rbr rbt rca rcb rcc rce rci rcn rco rcr rct re- rea reb rec ree rei ren reo rer ret ria rib ric rie rii rin rio rir rit rna rnb rnc rni rnn rno rnr rnt roa rob roc roe roi ron roo ror rot rra rrb rrc rri rrn rrr rrt rta rtb rtc rte rti rtn rto rtr rtt taa tab tac tae tai tan tao tar tat tba tbb tbc tbe tbi tbn tbo tbr tbt tca tcb tcc tce tci tcn tco tcr tct te- tea teb tec tee tei ten teo ter tet tia tib tic tie tii tin tio tir tit tna tnb tnc tne tni tnn tno tnr tnt to- toa tob toc toe toi ton too tor tot tra trb trc tre tri trn tro trr trt tta ttb ttc tte tti ttn tto ttr ttt