-er b-p bbb bbe bbg bbi bbp bbr bbs be- beb bee beg bei bep ber bes bgb bge bgg bgi bgp bgr bgs bi- bib bie big bii bip bir bis bpb bpe bpg bpi bpp bpr bps brb bre brg bri brp brr brs bsb bse bsg bsi bsp bsr bss ebb ebe ebg ebi ebp ebr ebs eeb eee eeg eep eer ees egb ege egg egi egp egr egs eib eie eig eii eip eir eis ep- epb epe epg epi epp epr eps erb ere erg eri erp err ers es- esb ese esg esi esp esr ess g-p gbe gbg gbi gbp gbr gbs ge- geb gee geg gei gep ger ges ggb ggg ggi ggp ggr ggs gib gie gig gii gip gir gis gpb gpe gpg gpi gpp gpr gps grb gre grg gri grp grr grs gsb gse gsg gsi gsp gsr gss ibb ibe ibg ibi ibp ibr ibs ie- iee ieg iei iep ier ies igb ige igg igi igp igr igs iib iie iii iip iir iis ipb ipe ipg ipi ipp ipr ips ir- irb ire irg iri irp irr irs is- isb ise isg isi isp isr iss p-p pbb pbe pbg pbi pbp pbr pbs peb pee peg pei pep per pes pgb pge pgg pgi pgp pgr pgs pib pie pig pii pip pir pis ppb ppe ppg ppi ppp ppr pps prb pre prg pri prp prr prs ps- psb pse psg psi psp psr pss rbb rbe rbg rbi rbp rbr rbs re- reb ree reg rei rep rer res rgb rge rgg rgi rgp rgr rgs rib rie rig rii rip rir ris rpb rpe rpg rpi rpp rpr rps rrb rrg rri rrp rrr rrs rsb rse rsg rsi rsp rsr rss sbb sbe sbg sbi sbp sbr sbs se- seb see seg sei sep ser ses sgb sge sgg sgi sgp sgr sgs sib sie sig sii sip sir sis spb spe spg spi spp spr sps sr- srb sre srg sri srp srr srs ss- ssb sse ssg ssi ssp ssr sss