-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aai aak aan aao aar aat ab- aba abb abc abe abi abk abn abo abr abt ac- aca acb acc ace aci ack acn aco acr act aea aeb aec aee aei aek aen aeo aer aet ai- aia aib aic aie aii aik ain aio air ait aka akb akc ake aki akk akn ako akr an- ana anb anc ane ani ank ann ano anr ant aoa aob aoc aoe aoi aok aon aoo aor aot ar- ara arb arc are ari ark arn aro arr art at- ata atb atc ate ati atn ato atr att baa bab bac bae bai bak ban bao bar bat bba bbb bbc bbe bbi bbk bbn bbo bbr bbt bca bcb bcc bce bci bck bcn bco bcr bct be- bea beb bec bee bei bek ben beo ber bet bi- bia bib bic bie bii bik bin bio bir bit bka bkb bkc bke bkk bkn bko bkr bkt bna bnb bnc bne bni bnk bnn bno bnr bnt boa bob boc boe boi bok bon boo bor bot bra brb bre bri brk brn bro brr brt bta btb btc bte bti btk btn bto btr btt c-- caa cab cac cae cai cak can cao car cat cba cbb cbc cbe cbi cbk cbn cbo cbr cbt cca ccb ccc cce cci cck ccn cco ccr cct ce- cea ceb cec cee cei cek cen ceo cer cet ci- cia cib cic cie cii cik cin cio cir cit cka ckb ckc cki cko ckt cn- cna cnb cnc cne cni cnn cno cnr cnt co- coa cob coc coe coi cok con coo cor cot cra crb crc cre cri crk crn cro crr crt cta ctb ctc cte cti ctk ctn cto ctr ctt eaa eab eac eae eai eak ean eao ear eat eba ebb ebc ebe ebi ebk ebn ebo ebr ebt ec- eca ecb ecc ece eci eck ecn eco ecr ect eea eeb eec eee eek een eeo eer eet eia eib eic eie eii eik ein eio eir eit eka ekb ekc eke eki eko ekr ekt en- ena enb enc ene eni enk enn eno enr ent eo- eoa eob eoc eoe eoi eok eon eoo eor eot era erb erc ere eri erk ern ero err ert eta etb etc ete eti etk etn eto etr ett ia- iaa iab iac iae iai ian iao iar iat iba ibb ibc ibe ibi ibk ibn ibo ibr ibt ica icb icc ice ici ick icn ico icr ict ie- iea iec iee iei iek ien ier iet iia iib iic iie iii iin iio iir iit ika ikb ikc ike iki ikk iko ikr ikt in- ina inb inc ine ini ink inn ino inr int io- ioa iob ioc ioe ioi ion ioo ior iot ir- ira irb irc ire iri irk irn iro irr irt ita itb itc ite iti itk itn ito itt k-t ka- kaa kab kac kae kai kak kan kao kar kat kba kbb kbc kbe kbi kbk kbn kbo kbr kca kcb kcc kce kci kck kcn kcr kct ke- kea keb kec kee kei kek ken keo ker ket kia kib kic kie kii kik kin kio kir kit kkb kkc kke kki kkk kkn kkr kkt kn- kna knc kne kni knk knn kno knr knt koa kob koc koe koi kok kon koo kor kot kra krc kri krk krn kro krr krt kta ktb ktc kte ktk ktn kto ktr ktt n-i naa nab nac nae nai nak nan nao nar nat nba nbb nbc nbe nbi nbk nbn nbo nbr nbt nca ncb ncc nce nci nck ncn nco ncr nct ne- nea neb nec nee nei nek nen neo ner net nia nib nic nie nii nik nin nio nir nit nka nkc nke nki nkk nkn nko nkr nkt nna nnb nnc nne nni nnk nnn nno nnt no- noa nob noc noe noi nok non noo nor not nra nrb nrc nre nri nrk nrn nro nrr nrt nta ntb ntc nte nti ntk ntn nto ntr ntt o-i oaa oab oac oae oai oak oan oao oar oat ob- oba obb obc obe obi obk obn obo obr obt oc- oca ocb occ oci ock ocn oco ocr oct oea oeb oec oee oei oen oeo oer oet oia oib oic oie oii oik oin oio oir oit oka okb okc oke oki okk oko okr on- ona onb onc one oni onk onn ono onr ont oo- ooa oob ooc ooi ook oon ooo oor oot or- ora orb orc ore ori ork orn oro orr ort ot- ota otb otc ote oti otk otn oto otr ott ra- raa rab rac rae rai rak ran rao rar rat rba rbb rbc rbe rbi rbk rbn rbo rbr rbt rca rcb rcc rce rci rcn rco rcr rct re- rea reb rec ree rei rek ren reo rer ret ria rib ric rie rii rik rin rio rir rit rkb rkc rke rkk rko rkt rna rnb rnc rni rnn rno rnr rnt roa rob roc roe roi rok ron roo ror rot rra rrb rrc rri rrk rrn rrr rrt rta rtb rtc rte rti rtk rtn rto rtr rtt taa tab tac tae tai tak tan tao tar tat tba tbb tbc tbe tbi tbk tbn tbo tbr tbt tca tcb tcc tce tci tck tcn tco tcr tct te- tea teb tec tee tei tek ten teo ter tet tia tib tic tie tii tik tin tio tir tit tka tkb tkc tke tkk tko tkr tkt tna tnb tnc tne tni tnk tnn tno tnr tnt to- toa tob toc toe toi tok ton too tor tot tra trb trc tre tri trk trn tro trr trt tta ttb ttc tte tti ttk ttn tto ttr