-er b-u bbb bbc bbe bbg bbh bbo bbr bbu bcb bcc bce bcg bch bco bcr bcu be- beb bec bee beg beh beo ber beu bgb bgc bge bgg bgh bgo bgr bgu bhb bhc bhe bhg bhh bho bhr bhu bob boc boe bog boh boo bor bou brb bre brg brh bro brr bru bub buc bue bug buh buo bur buu c-- cbb cbc cbe cbg cbh cbo cbr cbu ccb ccc cce ccg cch cco ccr ccu ce- ceb cec cee ceg ceh ceo cer ceu cgb cgc cge cgg cgh cgo cgr cgu ch- chb chc che chg chh cho chr chu co- cob coc coe cog coh coo cor cou crb crc cre crg crh cro crr cru cub cuc cue cug cuh cuo cur cuu ebb ebc ebe ebg ebh ebo ebr ebu ec- ecb ecc ece ecg ech eco ecr ecu eeb eec eee eeg eeo eer egb egc ege egg egh ego egr egu ehb ehc ehe ehg ehh eho ehr ehu eo- eob eoc eoe eog eoh eoo eor eou erb erc ere erg erh ero err eru eu- eub euc eue eug eur gbc gbe gbg gbh gbo gbr gbu gcb gcc gce gcg gch gco gcr gcu ge- geb gec gee geg geh geo ger geu ggb ggc ggg ggh ggo ggr ggu ghb ghc ghe ghg ghh gho ghr gob goc goe gog goh goo gor gou grb grc gre grg grh gro grr gru gu- gub guc gue gug guo gur guu hbb hbc hbe hbg hbh hbo hbr hbu hcb hcc hce hcg hch hco hcr he- heb hec hee heg heh heo her heu hgb hgc hge hgg hgh hgo hgr hgu hhb hhc hhe hhg hhh hho hhr hhu hob hoc hoe hog hoh hoo hor hou hr- hrb hrc hre hrg hrh hro hrr hru hub huc hue hug huh huo hur huu ob- obb obc obe obg obh obo obr obu oc- ocb occ ocg och oco ocr ocu oeb oec oee oeg oeh oeo oer ogc oge ogg ogh ogo ohc ohe ohg ohh oho ohr ohu oo- oob ooc oog ooh ooo oor or- orb orc ore org orh oro orr oru ou- ouc oue ouh ouo our rbb rbc rbe rbg rbh rbo rbr rbu rcb rcc rce rcg rch rco rcr rcu re- reb rec ree reg reh reo rer reu rgb rgc rge rgg rgh rgo rgr rh- rhb rhc rhe rhg rhh rho rhr rhu rob roc roe rog roh roo ror rou rrb rrc rrg rrh rrr rru rub ruc rue rug ruh ruo rur ruu ubb ubc ube ubg ubh ubo ubr ubu ucb ucc uce ucg uch uco ucr ucu ueb uec uee ueg ueh uer ugb ugc uge ugg ugh ugo ugr ugu uhb uhc uhe uhh uho uhr uhu uob uoc uoe uog uoo uor ur- urb urc ure urg uro urr uru uuc uue uug uur uuu