-er bbb bbc bbe bbf bbh bbo bbr bcb bcc bce bcf bch bco bcr be- beb bec bee bef beh beo ber bfb bfc bfe bff bfh bfo bfr bhb bhc bhe bhf bhh bho bhr bob boc boe bof boh boo bor brb bre brf brh bro brr c-- cbb cbc cbe cbf cbh cbo cbr ccb ccc cce ccf cch cco ccr ce- ceb cec cee cef ceh ceo cer cfb cfc cfe cff cfh cfo cfr ch- chb chc che chf chh cho chr co- cob coc coe cof coh coo cor crb crc cre crf crh cro crr ebb ebc ebe ebf ebh ebo ebr ec- ecb ecc ece ecf ech eco ecr eeb eec eee eef eeo eer ef- efb efc efe eff efh efo efr ehb ehc ehe ehf ehh eho ehr eo- eob eoc eoe eof eoh eoo eor erb erc ere erf erh ero err fbb fbc fbe fbf fbh fbo fbr fcb fcc fce fcf fco fcr feb fec fee fef feh feo fer ffc ffe fff ffh ffo ffr fhb fhc fhe fhf fhh fho fhr fob foc foe fof foh foo for frb frc fre frf frh fro frr hbb hbc hbe hbf hbh hbo hbr hcb hcc hce hcf hch hco hcr he- heb hec hee hef heh heo her hfb hfc hfe hff hfh hfo hfr hhb hhc hhe hhf hhh hho hhr hob hoc hoe hof hoh hoo hor hr- hrb hrc hre hrf hrh hro hrr ob- obb obc obe obf obh obo obr oc- ocb occ ocf och oco ocr oeb oec oee oef oeh oeo oer of- ofb ofc ofe off ofo ofr ohc ohe ohf ohh oho ohr oo- oob ooc oof ooh ooo oor or- orb orc ore orf orh oro orr rbb rbc rbe rbf rbh rbo rbr rcb rcc rce rcf rch rco rcr re- reb rec ree ref reh reo rer rfb rfc rfe rff rfh rfo rfr rh- rhb rhc rhe rhf rhh rho rhr rob roc roe rof roh roo ror rrb rrc rrf rrh rrr