-er a-a a-b a-c aaa aab aac aae aag aah aar aau ab- aba abb abc abe abg abh abr abu ac- aca acb acc ace acg ach acr acu aea aeb aec aee aeg aeh aer aeu ag- aga agb agc age agg agh agr agu aha ahb ahc ahe ahg ahh ahr ahu ar- ara arb arc are arg arh arr aru au- aua aub auc aue aug auh aur b-u baa bab bac bae bag bah bar bau bba bbb bbc bbe bbg bbh bbr bbu bca bcb bcc bce bcg bch bcr bcu be- bea beb bec bee beg beh ber beu bga bgb bgc bge bgg bgh bgr bgu bha bhb bhc bhe bhg bhh bhr bhu bra brb bre brg brh brr bru bua bub buc bue bug buh bur buu c-- caa cab cac cae cag cah car cau cba cbb cbc cbe cbg cbh cbr cbu cca ccb ccc cce ccg cch ccr ccu ce- cea ceb cec cee ceg ceh cer ceu cga cgb cgc cge cgg cgh cgr cgu ch- cha chb chc che chg chh chr chu cra crb crc cre crg crh crr cru cua cub cuc cue cug cuh cur cuu eaa eab eac eae eag eah ear eau eba ebb ebc ebe ebg ebh ebr ebu ec- eca ecb ecc ece ecg ech ecr ecu eea eeb eec eee eeg eer ega egb egc ege egg egh egr egu eha ehb ehc ehe ehg ehh ehr ehu era erb erc ere erg erh err eru eu- eua eub euc eue eug eur gaa gab gac gae gag gah gar gau gba gbc gbe gbg gbh gbr gbu gca gcb gcc gce gcg gch gcr gcu ge- gea geb gec gee geg geh ger geu gga ggb ggc ggg ggh ggr ggu gha ghb ghc ghe ghg ghh ghr gra grb grc gre grg grh grr gru gu- gua gub guc gue gug gur guu haa hab hac hae hag hah har hau hba hbb hbc hbe hbg hbh hbr hbu hca hcb hcc hce hcg hch hcr he- hea heb hec hee heg heh her heu hga hgb hgc hge hgg hgh hgr hgu hha hhb hhc hhe hhg hhh hhr hhu hr- hra hrb hrc hre hrg hrh hrr hru hua hub huc hue hug huh hur huu ra- raa rab rac rae rag rah rar rau rba rbb rbc rbe rbg rbh rbr rbu rca rcb rcc rce rcg rch rcr rcu re- rea reb rec ree reg reh rer reu rga rgb rgc rge rgg rgh rgr rh- rha rhb rhc rhe rhg rhh rhr rhu rra rrb rrc rrg rrh rrr rru rua rub ruc rue rug ruh rur ruu ua- uaa uab uac uae uag uah uar uau uba ubb ubc ube ubg ubh ubr ubu uca ucb ucc uce ucg uch ucr ucu uea ueb uec uee ueg ueh uer uga ugb ugc uge ugg ugh ugr ugu uha uhb uhc uhe uhh uhr uhu ur- ura urb urc ure urg urr uru uua uuc uue uug uur uuu