-er -ic b-p bbb bbc bbe bbg bbi bbo bbp bbr bbs bcb bcc bce bcg bci bco bcp bcr bcs be- beb bec bee beg bei beo bep ber bes bgb bgc bge bgg bgi bgo bgp bgr bgs bi- bib bic bie big bii bio bip bir bis bob boc boe bog boi boo bop bor bos bpb bpc bpe bpg bpi bpo bpp bpr bps brb bre brg bri bro brp brr brs bsb bsc bse bsg bsi bso bsp bsr bss c-- cbb cbc cbe cbg cbi cbo cbp cbr cbs ccb ccc cce ccg cci cco ccp ccr ccs ce- ceb cec cee ceg cei ceo cep cer ces cgb cgc cge cgg cgi cgo cgp cgr cgs ci- cib cic cie cig cii cio cip cir cis co- cob coc coe cog coi coo cop cor cos cpb cpc cpe cpg cpi cpo cpp cpr cps crb crc cre crg cri cro crp crr crs csb csc cse csg csi cso csp csr css ebb ebc ebe ebg ebi ebo ebp ebr ebs ec- ecb ecc ece ecg eci eco ecr ecs eeb eec eee eeg eeo eep eer ees egb egc ege egg egi ego egp egr egs eib eic eie eig eii eio eip eir eis eo- eob eoc eoe eog eoi eoo eop eor eos ep- epb epc epe epg epi epo epp epr eps erb erc ere erg eri ero erp err ers es- esb esc ese esg esi eso esp esr ess g-p gbc gbe gbg gbi gbo gbp gbr gbs gcb gcc gce gcg gci gco gcp gcr gcs ge- geb gec gee geg gei geo gep ger ges ggb ggc ggg ggi ggo ggp ggr ggs gib gic gie gig gii gio gip gir gis gob goc goe gog goi goo gop gor gos gpb gpc gpe gpg gpi gpo gpp gpr gps grb grc gre grg gri gro grp grr grs gsb gsc gse gsg gsi gso gsp gsr gss ibb ibc ibe ibg ibi ibo ibp ibr ibs icb icc ice icg ici ico icp icr ics ie- iec iee ieg iei iep ier ies igb igc ige igg igi igo igp igr igs iib iic iie iii iio iip iir iis io- iob ioc ioe iog ioi ioo iop ior ios ipb ipc ipe ipg ipi ipo ipp ipr ips ir- irb irc ire irg iri iro irp irr irs is- isb isc ise isg isi iso isp isr iss o-i ob- obb obc obe obg obi obo obp obr obs oc- ocb occ ocg oci oco ocp ocr ocs oeb oec oee oeg oei oeo oep oer oes ogc oge ogg ogi ogo ogp ogs oib oic oie oii oio oip oir ois oo- oob ooc oog ooi ooo oop oor oos op- opb opc ope opg opi opo opp opr ops or- orb orc ore org ori oro orp orr ors os- osb osc ose osg osi oso osp osr oss p-p pbb pbc pbe pbg pbi pbo pbp pbr pbs pcb pcc pce pcg pci pco pcp pcr pcs peb pec pee peg pei peo pep per pes pgb pgc pge pgg pgi pgo pgp pgr pgs pib pic pie pig pii pio pip pir pis pob poc poe pog poi poo pop por pos ppb ppc ppe ppg ppi ppo ppp ppr pps prb prc pre prg pri pro prp prr prs ps- psb psc pse psg psi pso psp psr pss rbb rbc rbe rbg rbi rbo rbp rbr rbs rcb rcc rce rcg rci rco rcp rcr rcs re- reb rec ree reg rei reo rep rer res rgb rgc rge rgg rgi rgo rgp rgr rgs rib ric rie rig rii rio rip rir ris rob roc roe rog roi roo rop ror ros rpb rpc rpe rpg rpi rpo rpp rpr rps rrb rrc rrg rri rrp rrr rrs rsb rsc rse rsg rsi rso rsp rsr rss sbb sbc sbe sbg sbi sbo sbp sbr sbs scb scc sce scg sci sco scp scr scs se- seb sec see seg sei seo sep ser ses sgb sgc sge sgg sgi sgo sgp sgr sgs sib sic sie sig sii sio sip sir sis sob soc soe sog soi soo sop sor sos spb spc spe spg spi spo spp spr sps sr- srb src sre srg sri sro srp srr srs ss- ssb ssc sse ssg ssi sso ssp ssr sss