-er b-u bbb bbc bbe bbh bbk bbr bbu bcb bcc bce bch bck bcr bcu be- beb bec bee beh bek ber beu bhb bhc bhe bhh bhk bhr bhu bkb bkc bke bkk bkr brb bre brh brk brr bru bub buc bue buh buk bur buu c-- cbb cbc cbe cbh cbk cbr cbu ccb ccc cce cch cck ccr ccu ce- ceb cec cee ceh cek cer ceu ch- chb chc che chh chk chr chu ckb ckc ckh crb crc cre crh crk crr cru cub cuc cue cuh cuk cur cuu ebb ebc ebe ebh ebk ebr ebu ec- ecb ecc ece ech eck ecr ecu eeb eec eee eek eer ehb ehc ehe ehh ehr ehu ekb ekc eke ekh ekr eku erb erc ere erh erk err eru eu- eub euc eue eur hbb hbc hbe hbh hbk hbr hbu hcb hcc hce hch hck hcr he- heb hec hee heh hek her heu hhb hhc hhe hhh hhk hhr hhu hkb hkh hkk hkr hku hr- hrb hrc hre hrh hrk hrr hru hub huc hue huh huk hur huu kbb kbc kbe kbh kbk kbr kbu kcb kcc kce kch kck kcr kcu ke- keb kec kee keh kek ker khe khh khk khr khu kkb kkc kke kkh kkk kkr kku krc krk krr kru kub kuc kue kuh kuk kur kuu rbb rbc rbe rbh rbk rbr rbu rcb rcc rce rch rcr rcu re- reb rec ree reh rek rer reu rh- rhb rhc rhe rhh rhr rhu rkb rkc rke rkk rku rrb rrc rrh rrk rrr rru rub ruc rue ruh ruk rur ruu ubb ubc ube ubh ubk ubr ubu ucb ucc uce uch uck ucr ucu ueb uec uee ueh uer uhb uhc uhe uhh uhr uhu ukb ukc uke ukk ukr uku ur- urb urc ure urk urr uru uuc uue uur uuu