-er a-a a-b a-c aaa aab aac aad aae aan aar aau ab- aba abb abc abd abe abn abr abu ac- aca acb acc acd ace acn acr acu ad- ada adb adc add ade adn adr adu aea aeb aec aed aee aen aer aeu an- ana anb anc and ane ann anr anu ar- ara arb arc ard are arn arr aru au- aua aub auc aud aue aun aur b-u baa bab bac bad bae ban bar bau bba bbb bbc bbd bbe bbn bbr bbu bca bcb bcc bcd bce bcn bcr bcu bda bdb bdc bdd bde bdr bdu be- bea beb bec bed bee ben ber beu bna bnb bnc bnd bne bnn bnr bnu bra brb brd bre brn brr bru bua bub buc bud bue bun bur buu c-- caa cab cac cad cae can car cau cba cbb cbc cbd cbe cbn cbr cbu cca ccb ccc ccd cce ccn ccr ccu cda cdb cdc cdd cde cdn cdr cdu ce- cea ceb cec ced cee cen cer ceu cn- cna cnb cnc cnd cne cnn cnr cnu cra crb crc crd cre crn crr cru cua cub cuc cud cue cun cur cuu daa dab dac dad dae dan dar dau dba dbb dbc dbd dbe dbn dbr dbu dca dcb dcc dcd dce dcn dcr dcu dda ddb ddc ddd dde ddn ddr ddu de- dea deb dec ded dee den der deu dna dnb dnc dnd dne dnn dnr dra drb drc drd dre drn drr dru dua dub duc dud due dun dur eaa eab eac ead eae ean ear eau eba ebb ebc ebd ebe ebn ebr ebu ec- eca ecb ecc ecd ece ecn ecr ecu ed- eda edb edc edd ede edn edr edu eea eeb eec eed eee een eer en- ena enb enc end ene enn enr enu era erb erc erd ere ern err eru eu- eua eub euc eud eue eun eur naa nab nac nad nae nan nar nau nba nbb nbc nbd nbe nbn nbr nbu nca ncb ncc ncd nce ncn ncr ncu nda ndb ndc ndd nde ndn ndr ndu ne- nea neb nec ned nee nen ner neu nna nnb nnc nne nnn nnu nra nrb nrc nrd nre nrn nrr nru nua nub nuc nud nue nun nur nuu ra- raa rab rac rad rae ran rar rau rba rbb rbc rbd rbe rbn rbr rbu rca rcb rcc rcd rce rcn rcr rcu rda rdb rdc rdd rde rdn rdr rdu re- rea reb rec red ree ren rer reu rna rnb rnc rnd rnn rnr rnu rra rrb rrc rrd rrn rrr rru rua rub ruc rud rue run rur ruu ua- uaa uab uac uad uae uan uar uau uba ubb ubc ube ubn ubr ubu uca ucb ucc ucd uce ucn ucr ucu uda udb udc udd ude udn udr udu uea ueb uec ued uee uen uer un- una unb unc und une unn unr unu ur- ura urb urc urd ure urn urr uru uua uuc uue uun uur uuu