-er a-a a-b a-c aaa aab aac aae aag aah aao aar aau ab- aba abb abc abe abg abh abo abr abu ac- aca acb acc ace acg ach aco acr acu aea aeb aec aee aeg aeh aeo aer aeu ag- aga agb agc age agg agh ago agr agu aha ahb ahc ahe ahg ahh aho ahr ahu aoa aob aoc aoe aog aoh aoo aor aou ar- ara arb arc are arg arh aro arr aru au- aua aub auc aue aug auh auo aur b-u baa bab bac bae bag bah bao bar bau bba bbb bbc bbe bbg bbh bbo bbr bbu bca bcb bcc bce bcg bch bco bcr bcu be- bea beb bec bee beg beh beo ber beu bga bgb bgc bge bgg bgh bgo bgr bgu bha bhb bhc bhe bhg bhh bho bhr bhu boa bob boc boe bog boh boo bor bou bra brb bre brg brh bro brr bru bua bub buc bue bug buh buo bur buu c-- caa cab cac cae cag cah cao car cau cba cbb cbc cbe cbg cbh cbo cbr cbu cca ccb ccc cce ccg cch cco ccr ccu ce- cea ceb cec cee ceg ceh ceo cer ceu cga cgb cgc cge cgg cgh cgo cgr cgu ch- cha chb chc che chg chh cho chr chu co- coa cob coc coe cog coh coo cor cou cra crb crc cre crg crh cro crr cru cua cub cuc cue cug cuh cuo cur cuu eaa eab eac eae eag eah eao ear eau eba ebb ebc ebe ebg ebh ebo ebr ebu ec- eca ecb ecc ece ecg ech eco ecr ecu eea eeb eec eee eeg eeo eer ega egb egc ege egg egh ego egr egu eha ehb ehc ehe ehg ehh eho ehr ehu eo- eoa eob eoc eoe eog eoh eoo eor eou era erb erc ere erg erh ero err eru eu- eua eub euc eue eug eur gaa gab gac gae gag gah gao gar gau gba gbc gbe gbg gbh gbo gbr gbu gca gcb gcc gce gcg gch gco gcr gcu ge- gea geb gec gee geg geh geo ger geu gga ggb ggc ggg ggh ggo ggr ggu gha ghb ghc ghe ghg ghh gho ghr goa gob goc goe gog goh goo gor gou gra grb grc gre grg grh gro grr gru gu- gua gub guc gue gug guo gur guu haa hab hac hae hag hah hao har hau hba hbb hbc hbe hbg hbh hbo hbr hbu hca hcb hcc hce hcg hch hco hcr he- hea heb hec hee heg heh heo her heu hga hgb hgc hge hgg hgh hgo hgr hgu hha hhb hhc hhe hhg hhh hho hhr hhu hoa hob hoc hoe hog hoh hoo hor hou hr- hra hrb hrc hre hrg hrh hro hrr hru hua hub huc hue hug huh huo hur huu oaa oab oac oae oag oah oao oar oau ob- oba obb obc obe obg obh obo obr obu oc- oca ocb occ ocg och oco ocr ocu oea oeb oec oee oeg oeh oeo oer oga ogc oge ogg ogh ogo oha ohc ohe ohg ohh oho ohr ohu oo- ooa oob ooc oog ooh ooo oor or- ora orb orc ore org orh oro orr oru ou- oua ouc oue ouh ouo our ra- raa rab rac rae rag rah rao rar rau rba rbb rbc rbe rbg rbh rbo rbr rbu rca rcb rcc rce rcg rch rco rcr rcu re- rea reb rec ree reg reh reo rer reu rga rgb rgc rge rgg rgh rgo rgr rh- rha rhb rhc rhe rhg rhh rho rhr rhu roa rob roc roe rog roh roo ror rou rra rrb rrc rrg rrh rrr rru rua rub ruc rue rug ruh ruo rur ruu ua- uaa uab uac uae uag uah uao uar uau uba ubb ubc ube ubg ubh ubo ubr ubu uca ucb ucc uce ucg uch uco ucr ucu uea ueb uec uee ueg ueh uer uga ugb ugc uge ugg ugh ugo ugr ugu uha uhb uhc uhe uhh uho uhr uhu uoa uob uoc uoe uog uoo uor ur- ura urb urc ure urg uro urr uru uua uuc uue uug uur uuu