-er b-u bbb bbc bbd bbe bbg bbk bbr bbu bcb bcc bcd bce bcg bck bcr bcu bdb bdc bdd bde bdg bdk bdr bdu be- beb bec bed bee beg bek ber beu bgb bgc bgd bge bgg bgk bgr bgu bkb bkc bke bkg bkk bkr brb brd bre brg brk brr bru bub buc bud bue bug buk bur buu c-- cbb cbc cbd cbe cbg cbk cbr cbu ccb ccc ccd cce ccg cck ccr ccu cdb cdc cdd cde cdg cdk cdr cdu ce- ceb cec ced cee ceg cek cer ceu cgb cgc cgd cge cgg cgr cgu ckb ckc ckd crb crc crd cre crg crk crr cru cub cuc cud cue cug cuk cur cuu dbb dbc dbd dbe dbg dbk dbr dbu dcb dcc dcd dce dcg dck dcr dcu ddb ddc ddd dde ddg ddk ddr ddu de- deb dec ded dee deg dek der deu dgc dgd dge dgg dgk dgr dgu dkb dkc dke dkg dkk dkr dku drb drc drd dre drg drk drr dru dub duc dud due dug duk dur ebb ebc ebd ebe ebg ebk ebr ebu ec- ecb ecc ecd ece ecg eck ecr ecu ed- edb edc edd ede edg edk edr edu eeb eec eed eee eeg eek eer egb egc egd ege egg egr egu ekb ekc ekd eke ekg ekr eku erb erc erd ere erg erk err eru eu- eub euc eud eue eug eur g-d gbc gbd gbe gbg gbk gbr gbu gcb gcc gcd gce gcg gck gcr gcu gdb gdc gdd gde gdk gdr gdu ge- geb gec ged gee geg gek ger geu ggb ggc ggd ggg ggr ggu gkb gkd grb grc grd gre grg grk grr gru gu- gub guc gud gue gug guk gur guu kbb kbc kbd kbe kbk kbr kbu kcb kcc kcd kce kcg kck kcr kcu kdb kdc kde kdg kdk kdr kdu ke- keb kec ked kee keg kek ker kgb kgc kgd kgu kkb kkc kke kkk kkr kku krc krd krg krk krr kru kub kuc kud kue kug kuk kur kuu rbb rbc rbd rbe rbg rbk rbr rbu rcb rcc rcd rce rcg rcr rcu rdb rdc rdd rde rdg rdr rdu re- reb rec red ree reg rek rer reu rgb rgc rgd rge rgg rgk rgr rkb rkc rke rkg rkk rku rrb rrc rrd rrg rrk rrr rru rub ruc rud rue rug ruk rur ruu ubb ubc ube ubg ubk ubr ubu ucb ucc ucd uce ucg uck ucr ucu udb udc udd ude udg udk udr udu ueb uec ued uee ueg uer ugb ugc uge ugg ugk ugr ugu ukb ukc uke ukk ukr uku ur- urb urc urd ure urg urk urr uru uuc uue uug uur uuu