-er a-a a-b aaa aab aad aae aaf aan aar aau ab- aba abb abd abe abf abn abr abu ad- ada adb add ade adf adn adr adu aea aeb aed aee aef aen aer aeu af- afa afb afd afe aff afn afr afu an- ana anb and ane anf ann anr anu ar- ara arb ard are arf arn arr aru au- aua aub aud aue auf aun aur b-u baa bab bad bae baf ban bar bau bba bbb bbd bbe bbf bbn bbr bbu bda bdb bdd bde bdf bdr bdu be- bea beb bed bee bef ben ber beu bfa bfb bfd bfe bff bfn bfr bfu bna bnb bnd bne bnf bnn bnr bnu bra brb brd bre brf brn brr bru bua bub bud bue buf bun bur buu daa dab dad dae daf dan dar dau dba dbb dbd dbe dbf dbn dbr dbu dda ddb ddd dde ddf ddn ddr ddu de- dea deb ded dee def den der deu dfa dfb dfd dfe dff dfn dfr dfu dna dnb dnd dne dnf dnn dnr dra drb drd dre drn drr dru dua dub dud due duf dun dur eaa eab ead eae eaf ean ear eau eba ebb ebd ebe ebf ebn ebr ebu ed- eda edb edd ede edf edn edr edu eea eeb eed eee eef een eer ef- efa efb efd efe eff efr en- ena enb end ene enf enn enr enu era erb erd ere erf ern err eru eu- eua eub eud eue euf eun eur faa fab fad fae faf fan far fau fba fbb fbd fbe fbf fbn fbr fbu fda fdb fdd fde fdf fdn fdr fdu fea feb fed fee fef fen fer feu ffa ffd ffe fff ffn ffr ffu fna fnb fnd fne fnf fnn fnr fnu fra frb frd fre frf frn frr fru fua fub fud fue fuf fun fur fuu naa nab nad nae naf nan nar nau nba nbb nbd nbe nbf nbn nbr nbu nda ndb ndd nde ndf ndn ndr ndu ne- nea neb ned nee nef nen ner neu nfa nfb nfd nfe nff nfn nfr nfu nna nnb nne nnf nnn nnu nra nrb nrd nre nrf nrn nrr nru nua nub nud nue nun nur nuu ra- raa rab rad rae raf ran rar rau rba rbb rbd rbe rbf rbn rbr rbu rda rdb rdd rde rdf rdn rdr rdu re- rea reb red ree ref ren rer reu rfa rfb rfd rfe rff rfn rfr rfu rna rnb rnd rnn rnr rnu rra rrb rrd rrf rrn rrr rru rua rub rud rue ruf run rur ruu ua- uaa uab uad uae uaf uan uar uau uba ubb ube ubf ubn ubr ubu uda udb udd ude udf udn udr udu uea ueb ued uee uef uen uer ufa ufd ufe uff ufn ufr ufu un- una unb und une unf unn unr unu ur- ura urb urd ure urf urn urr uru uua uue uun uur uuu