-er b-u bbb bbc bbe bbh bbo bbq bbr bbu bcb bcc bce bch bco bcq bcr bcu be- beb bec bee beh beo beq ber beu bhb bhc bhe bhh bho bhq bhr bhu bob boc boe boh boo boq bor bou bqc bqe brb bre brh bro brq brr bru bub buc bue buh buo bur buu c-- cbb cbc cbe cbh cbo cbq cbr cbu ccb ccc cce cch cco ccr ccu ce- ceb cec cee ceh ceo ceq cer ceu ch- chb chc che chh cho chq chr chu co- cob coc coe coh coo coq cor cou cqb cqc cqo crb crc cre crh cro crq crr cru cub cuc cue cuh cuo cuq cur cuu ebb ebc ebe ebh ebo ebq ebr ebu ec- ecb ecc ece ech eco ecq ecr ecu eeb eec eee eeo eer ehb ehc ehe ehh eho ehr ehu eo- eob eoc eoe eoh eoo eoq eor eou eqe eqq equ erb erc ere erh ero erq err eru eu- eub euc eue eur hbb hbc hbe hbh hbo hbr hbu hcb hcc hce hch hco hcr he- heb hec hee heh heo her heu hhb hhc hhe hhh hho hhr hhu hob hoc hoe hoh hoo hor hou hr- hrb hrc hre hrh hro hrr hru hub huc hue huh huo huq hur huu ob- obb obc obe obh obo obr obu oc- ocb occ och oco ocr ocu oeb oec oee oeh oeo oer ohc ohe ohh oho ohq ohr ohu oo- oob ooc ooh ooo oor oqb oqo or- orb orc ore orh oro orr oru ou- ouc oue ouh ouo our qbc qbe qbq qcc qco qec qee qeh qeo qhc qoo qor qqq qqu qrb qrc qre qrh qru qu- que quh quo qur rbb rbc rbe rbh rbo rbr rbu rcb rcc rce rch rco rcr rcu re- reb rec ree reh reo req rer reu rh- rhb rhc rhe rhh rho rhr rhu rob roc roe roh roo ror rou rqc rrb rrc rrh rrq rrr rru rub ruc rue ruh ruo rur ruu ubb ubc ube ubh ubo ubr ubu ucb ucc uce uch uco ucr ucu ueb uec uee ueh uer uhb uhc uhe uhh uho uhq uhr uhu uob uoc uoe uoo uor ur- urb urc ure uro urr uru uuc uue uur uuu