-er a-a a-b a-c aaa aab aac aae aah aan aao aar aau ab- aba abb abc abe abh abn abo abr abu ac- aca acb acc ace ach acn aco acr acu aea aeb aec aee aeh aen aeo aer aeu aha ahb ahc ahe ahh ahn aho ahr ahu an- ana anb anc ane anh ann ano anr anu aoa aob aoc aoe aoh aon aoo aor aou ar- ara arb arc are arh arn aro arr aru au- aua aub auc aue auh aun auo aur b-u baa bab bac bae bah ban bao bar bau bba bbb bbc bbe bbh bbn bbo bbr bbu bca bcb bcc bce bch bcn bco bcr bcu be- bea beb bec bee beh ben beo ber beu bha bhb bhc bhe bhh bho bhr bhu bna bnb bnc bne bnn bno bnr bnu boa bob boc boe boh bon boo bor bou bra brb bre brh brn bro brr bru bua bub buc bue buh bun buo bur buu c-- caa cab cac cae cah can cao car cau cba cbb cbc cbe cbh cbn cbo cbr cbu cca ccb ccc cce cch ccn cco ccr ccu ce- cea ceb cec cee ceh cen ceo cer ceu ch- cha chb chc che chh chn cho chr chu cn- cna cnb cnc cne cnh cnn cno cnr cnu co- coa cob coc coe coh con coo cor cou cra crb crc cre crh crn cro crr cru cua cub cuc cue cuh cun cuo cur cuu eaa eab eac eae eah ean eao ear eau eba ebb ebc ebe ebh ebn ebo ebr ebu ec- eca ecb ecc ece ech ecn eco ecr ecu eea eeb eec eee een eeo eer eha ehb ehc ehe ehh ehn eho ehr ehu en- ena enb enc ene enh enn eno enr enu eo- eoa eob eoc eoe eoh eon eoo eor eou era erb erc ere erh ern ero err eru eu- eua eub euc eue eun eur haa hab hac hae hah han hao har hau hba hbb hbc hbe hbh hbn hbo hbr hbu hca hcb hcc hce hch hcn hco hcr he- hea heb hec hee heh hen heo her heu hha hhb hhc hhe hhh hhn hho hhr hhu hna hnb hnc hne hnh hnn hno hnu hoa hob hoc hoe hoh hon hoo hor hou hr- hra hrb hrc hre hrh hrn hro hrr hru hua hub huc hue huh hun huo hur huu naa nab nac nae nah nan nao nar nau nba nbb nbc nbe nbn nbo nbr nbu nca ncb ncc nce nch ncn nco ncr ncu ne- nea neb nec nee neh nen neo ner neu nha nhb nhc nhe nhh nhn nhr nhu nna nnb nnc nne nnh nnn nno nnu no- noa nob noc noe noh non noo nor nou nra nrb nrc nre nrn nro nrr nru nua nub nuc nue nuh nun nuo nur nuu oaa oab oac oae oah oan oao oar oau ob- oba obb obc obe obh obn obo obr obu oc- oca ocb occ och ocn oco ocr ocu oea oeb oec oee oeh oen oeo oer oha ohc ohe ohh ohn oho ohr ohu on- ona onb onc one onh onn ono onr onu oo- ooa oob ooc ooh oon ooo oor or- ora orb orc ore orh orn oro orr oru ou- oua ouc oue ouh oun ouo our ra- raa rab rac rae rah ran rao rar rau rba rbb rbc rbe rbh rbn rbo rbr rbu rca rcb rcc rce rch rcn rco rcr rcu re- rea reb rec ree reh ren reo rer reu rh- rha rhb rhc rhe rhh rhn rho rhr rhu rna rnb rnc rnh rnn rno rnr rnu roa rob roc roe roh ron roo ror rou rra rrb rrc rrh rrn rrr rru rua rub ruc rue ruh run ruo rur ruu ua- uaa uab uac uae uah uan uao uar uau uba ubb ubc ube ubh ubn ubo ubr ubu uca ucb ucc uce uch ucn uco ucr ucu uea ueb uec uee ueh uen uer uha uhb uhc uhe uhh uho uhr uhu un- una unb unc une unh unn uno unr unu uoa uob uoc uoe uon uoo uor ur- ura urb urc ure urn uro urr uru uua uuc uue uun uur uuu