-er a-a a-b a-i aaa aab aae aai aak aan aar aav ab- aba abb abe abi abk abn abr abv aea aeb aee aei aek aen aer aev ai- aia aib aie aii aik ain air aiv aka akb ake aki akk akn akr akv an- ana anb ane ani ank ann anr anv ar- ara arb are ari ark arn arr arv av- ava avb ave avi avk avn avr baa bab bae bai bak ban bar bav bba bbb bbe bbi bbk bbn bbr be- bea beb bee bei bek ben ber bev bi- bia bib bie bii bik bin bir biv bka bkb bke bkk bkn bkr bkv bna bnb bne bni bnk bnn bnr bnv bra brb bre bri brk brn brr brv bva bvb bve bvi bvk bvn bvr bvv eaa eab eae eai eak ean ear eav eba ebb ebe ebi ebk ebn ebr ebv eea eeb eee eek een eer eev eia eib eie eii eik ein eir eiv eka ekb eke eki ekr ekv en- ena enb ene eni enk enn enr env era erb ere eri erk ern err erv eva evb eve evi evn evr evv i-v ia- iaa iab iae iai ian iar iav iba ibb ibe ibi ibk ibn ibr ibv ie- iea iee iei iek ien ier iev iia iib iie iii iin iir ika ikb ike iki ikk ikr ikv in- ina inb ine ini ink inn inr inv ir- ira irb ire iri irk irn irr irv iva ivb ive ivi ivr ivv ka- kaa kab kae kai kak kan kar kav kba kbb kbe kbi kbk kbn kbr ke- kea keb kee kei kek ken ker kev kia kib kie kii kik kin kir kiv kkb kke kki kkk kkn kkr kkv kn- kna kne kni knk knn knr kra kri krk krn krr krv kva kvb kvi kvk kvn kvr kvv n-i naa nab nae nai nak nan nar nav nba nbb nbe nbi nbk nbn nbr nbv ne- nea neb nee nei nek nen ner nev nia nib nie nii nik nin nir niv nka nke nki nkk nkn nkr nna nnb nne nni nnk nnn nnv nra nrb nre nri nrk nrn nrr nrv nva nvb nve nvi nvk nvn nvv ra- raa rab rae rai rak ran rar rav rba rbb rbe rbi rbk rbn rbr re- rea reb ree rei rek ren rer rev ria rib rie rii rik rin rir riv rkb rke rkk rkv rna rnb rni rnn rnr rnv rra rrb rri rrk rrn rrr rva rvb rve rvi rvn rvr rvv v-a v-e vaa vab vae vai vak van var vav vba vbi vbk vbr vbv vea veb vee vei vek ven ver vi- via vib vie vii vik vin vir viv vka vkb vn- vna vni vnr vnv vra vrb vre vri vrk vrn vrr vva vvb vvi vvr vvv