-er bbb bbe bbf bbg bbi bbl bbm bbr bbs be- beb bee bef beg bei bel bem ber bes bfb bfe bff bfg bfi bfl bfm bfr bfs bgb bge bgf bgg bgi bgl bgm bgr bgs bi- bib bie bif big bii bil bim bir bis blb ble blf blg bli bll blm blr bls bmb bme bmf bmg bmi bml bmm bmr bms brb bre brf brg bri brl brm brr brs bsb bse bsf bsg bsi bsl bsm bsr bss ebb ebe ebf ebg ebi ebl ebm ebr ebs eeb eee eef eeg eel eem eer ees ef- efb efe eff efg efi efl efm efr efs egb ege egf egg egi egl egm egr egs eib eie eif eig eii eil eim eir eis elb ele elf elg eli ell elm elr els em- emb eme emf emg emi eml emm emr ems erb ere erf erg eri erl erm err ers es- esb ese esf esg esi esl esm esr ess fbb fbe fbf fbg fbi fbl fbm fbr fbs feb fee fef feg fei fel fem fer fes ffe fff ffg ffi ffl ffm ffr ffs fgb fge fgf fgg fgi fgl fgm fgr fgs fib fie fif fig fii fil fim fir fis flb fle flf flg fli fll flm flr fls fmb fme fmf fmg fmi fml fmm fmr fms frb fre frf frg fri frl frm frr frs fsb fse fsf fsg fsi fsl fsm fsr fss gbe gbf gbg gbi gbl gbm gbr gbs ge- geb gee gef geg gei gel gem ger ges gfb gfe gff gfi gfl gfm gfr gfs ggb ggg ggi ggm ggr ggs gib gie gif gig gii gil gim gir gis glb gle glf glg gli gll glm glr gls gmb gme gmf gmg gmi gml gmm gmr gms grb gre grf grg gri grl grm grr grs gsb gse gsf gsg gsi gsl gsm gsr gss i-f ibb ibe ibf ibg ibi ibl ibm ibr ibs ie- iee ief ieg iei iel iem ier ies ifb ife iff ifg ifi ifl ifm ifr ifs igb ige igf igg igi igl igm igr igs iib iie iif iii iil iim iir iis il- ilb ile ilf ilg ili ill ilm ilr ils im- imb ime imf img imi iml imm ims ir- irb ire irf irg iri irl irm irr irs is- isb ise isf isg isi isl ism isr iss lbb lbe lbf lbg lbi lbl lbm lbr lbs leb lee lef leg lei lel lem ler les lfb lfe lff lfg lfi lfl lfm lfr lfs lgb lge lgf lgg lgi lgl lgm lgr lgs lib lie lif lig lii lil lim lir lis llb lle llf llg lli lll llm llr lls lmb lme lmf lmg lmi lml lmm lmr lms lrb lrf lrg lri lrm lrr lrs lsb lse lsf lsg lsi lsl lsm lsr lss m-f m-r mbb mbe mbf mbg mbi mbl mbm mbr mbs meb mee mef meg mei mel mem mer mes mfb mfe mff mfg mfi mfl mfm mfr mfs mgb mge mgf mgi mgl mgm mgr mgs mi- mib mie mif mig mii mil mim mir mis mlb mle mlf mlg mli mll mlm mlr mls mmb mme mmf mmg mmi mml mmm mmr mms mrb mre mrf mrg mri mrl mrm mrr mrs msb mse msf msg msi msl msm msr mss rbb rbe rbf rbg rbi rbl rbm rbr rbs re- reb ree ref reg rei rel rem rer res rfb rfe rff rfg rfi rfl rfm rfr rfs rgb rge rgf rgg rgi rgr rgs rib rie rif rig rii ril rim rir ris rle rlf rlg rli rll rlm rlr rls rmb rme rmf rmg rmi rml rmm rmr rms rrb rrf rrg rri rrl rrm rrr rrs rsb rse rsf rsg rsi rsl rsm rsr rss sbb sbe sbf sbg sbi sbl sbm sbr sbs se- seb see sef seg sei sel sem ser ses sfb sfe sff sfg sfi sfl sfm sfr sfs sgb sge sgf sgg sgi sgl sgm sgr sgs sib sie sif sig sii sil sim sir sis slb sle slf slg sli sll slm slr sls smb sme smf smg smi sml smm smr sms sr- srb sre srf srg sri srl srm srr srs ss- ssb sse ssf ssg ssi ssl ssm ssr sss