-er -ic b-p bbb bbc bbd bbe bbg bbi bbp bbr bcb bcc bcd bce bcg bci bcp bcr bdb bdc bdd bde bdg bdi bdp bdr be- beb bec bed bee beg bei bep ber bgb bgc bgd bge bgg bgi bgp bgr bi- bib bic bid bie big bii bip bir bpb bpc bpd bpe bpg bpi bpp bpr brb brd bre brg bri brp brr c-- cbb cbc cbd cbe cbg cbi cbp cbr ccb ccc ccd cce ccg cci ccp ccr cdb cdc cdd cde cdg cdi cdp cdr ce- ceb cec ced cee ceg cei cep cer cgb cgc cgd cge cgg cgi cgp cgr ci- cib cic cid cie cig cii cip cir cpb cpc cpd cpe cpg cpi cpp cpr crb crc crd cre crg cri crp crr dbb dbc dbd dbe dbg dbi dbp dbr dcb dcc dcd dce dcg dci dcp dcr ddb ddc ddd dde ddg ddi ddp ddr de- deb dec ded dee deg dei dep der dgc dgd dge dgg dgi dgp dgr di- dib dic did die dig dii dip dir dpb dpc dpd dpe dpg dpi dpp dpr drb drc drd dre drg dri drp drr ebb ebc ebd ebe ebg ebi ebp ebr ec- ecb ecc ecd ece ecg eci ecr ed- edb edc edd ede edg edi edp edr eeb eec eed eee eeg eep eer egb egc egd ege egg egi egp egr eib eic eid eie eig eii eip eir ep- epb epc epd epe epg epi epp epr erb erc erd ere erg eri erp err g-d g-p gbc gbd gbe gbg gbi gbp gbr gcb gcc gcd gce gcg gci gcp gcr gdb gdc gdd gde gdi gdp gdr ge- geb gec ged gee geg gei gep ger ggb ggc ggd ggg ggi ggp ggr gib gic gid gie gig gii gip gir gpb gpc gpd gpe gpg gpi gpp gpr grb grc grd gre grg gri grp grr i-d ibb ibc ibd ibe ibg ibi ibp ibr icb icc icd ice icg ici icp icr idb idc idd ide idg idi idp idr ie- iec ied iee ieg iei iep ier igb igc igd ige igg igi igp igr iib iic iid iie iii iip iir ipb ipc ipd ipe ipg ipi ipp ipr ir- irb irc ird ire irg iri irp irr p-p pbb pbc pbd pbe pbg pbi pbp pbr pcb pcc pcd pce pcg pci pcp pcr pdb pdc pdd pde pdg pdi pdp pdr peb pec ped pee peg pei pep per pgb pgc pgd pge pgg pgi pgp pgr pib pic pid pie pig pii pip pir ppb ppc ppd ppe ppg ppi ppp ppr prb prc prd pre prg pri prp prr rbb rbc rbd rbe rbg rbi rbp rbr rcb rcc rcd rce rcg rci rcp rcr rdb rdc rdd rde rdg rdi rdp rdr re- reb rec red ree reg rei rep rer rgb rgc rgd rge rgg rgi rgp rgr rib ric rid rie rig rii rip rir rpb rpc rpd rpe rpg rpi rpp rpr rrb rrc rrd rrg rri rrp rrr