-er -ic b-p bbb bbc bbe bbg bbi bbn bbp bbr bbs bcb bcc bce bcg bci bcn bcp bcr bcs be- beb bec bee beg bei ben bep ber bes bgb bgc bge bgg bgi bgn bgp bgr bgs bi- bib bic bie big bii bin bip bir bis bnb bnc bne bng bni bnn bnp bnr bns bpb bpc bpe bpg bpi bpn bpp bpr bps brb bre brg bri brn brp brr brs bsb bsc bse bsg bsi bsn bsp bsr bss c-- cbb cbc cbe cbg cbi cbn cbp cbr cbs ccb ccc cce ccg cci ccn ccp ccr ccs ce- ceb cec cee ceg cei cen cep cer ces cgb cgc cge cgg cgi cgn cgp cgr cgs ci- cib cic cie cig cii cin cip cir cis cn- cnb cnc cne cng cni cnn cnp cnr cns cpb cpc cpe cpg cpi cpn cpp cpr cps crb crc cre crg cri crn crp crr crs csb csc cse csg csi csn csp csr css ebb ebc ebe ebg ebi ebn ebp ebr ebs ec- ecb ecc ece ecg eci ecn ecr ecs eeb eec eee eeg een eep eer ees egb egc ege egg egi egn egp egr egs eib eic eie eig eii ein eip eir eis en- enb enc ene eng eni enn enp enr ens ep- epb epc epe epg epi epn epp epr eps erb erc ere erg eri ern erp err ers es- esb esc ese esg esi esn esp esr ess g-p gbc gbe gbg gbi gbn gbp gbr gbs gcb gcc gce gcg gci gcn gcp gcr gcs ge- geb gec gee geg gei gen gep ger ges ggb ggc ggg ggi ggn ggp ggr ggs gib gic gie gig gii gin gip gir gis gnb gnc gne gni gnn gnp gnr gns gpb gpc gpe gpg gpi gpn gpp gpr gps grb grc gre grg gri grn grp grr grs gsb gsc gse gsg gsi gsn gsp gsr gss ibb ibc ibe ibg ibi ibn ibp ibr ibs icb icc ice icg ici icn icp icr ics ie- iec iee ieg iei ien iep ier ies igb igc ige igg igi ign igp igr igs iib iic iie iii iin iip iir iis in- inb inc ine ing ini inn inp inr ins ipb ipc ipe ipg ipi ipn ipp ipr ips ir- irb irc ire irg iri irn irp irr irs is- isb isc ise isg isi isn isp isr iss n-i nbb nbc nbe nbg nbi nbn nbp nbr nbs ncb ncc nce ncg nci ncn ncp ncr ncs ne- neb nec nee neg nei nen nep ner nes ngb ngc nge ngg ngi ngn ngp ngs nib nic nie nig nii nin nip nir nis nnb nnc nne nng nni nnn nnp nns npb npc npe npg npi npn npp npr nps nrb nrc nre nrg nri nrn nrp nrr nrs nsb nsc nse nsg nsi nsn nsp nsr nss p-p pbb pbc pbe pbg pbi pbn pbp pbr pbs pcb pcc pce pcg pci pcn pcp pcr pcs peb pec pee peg pei pen pep per pes pgb pgc pge pgg pgi pgn pgp pgr pgs pib pic pie pig pii pin pip pir pis pn- pnb pnc pne png pni pnn pnp pnr pns ppb ppc ppe ppg ppi ppn ppp ppr pps prb prc pre prg pri prn prp prr prs ps- psb psc pse psg psi psn psp psr pss rbb rbc rbe rbg rbi rbn rbp rbr rbs rcb rcc rce rcg rci rcn rcp rcr rcs re- reb rec ree reg rei ren rep rer res rgb rgc rge rgg rgi rgn rgp rgr rgs rib ric rie rig rii rin rip rir ris rnb rnc rng rni rnn rnp rnr rns rpb rpc rpe rpg rpi rpn rpp rpr rps rrb rrc rrg rri rrn rrp rrr rrs rsb rsc rse rsg rsi rsn rsp rsr rss sbb sbc sbe sbg sbi sbn sbp sbr sbs scb scc sce scg sci scn scp scr scs se- seb sec see seg sei sen sep ser ses sgb sgc sge sgg sgi sgn sgp sgr sgs sib sic sie sig sii sin sip sir sis snb snc sne sng sni snn snp snr sns spb spc spe spg spi spn spp spr sps sr- srb src sre srg sri srn srp srr srs ss- ssb ssc sse ssg ssi ssn ssp ssr sss