-er -ic bbb bbc bbe bbg bbi bbo bbr bbs bcb bcc bce bcg bci bco bcr bcs be- beb bec bee beg bei beo ber bes bgb bgc bge bgg bgi bgo bgr bgs bi- bib bic bie big bii bio bir bis bob boc boe bog boi boo bor bos brb bre brg bri bro brr brs bsb bsc bse bsg bsi bso bsr bss c-- cbb cbc cbe cbg cbi cbo cbr cbs ccb ccc cce ccg cci cco ccr ccs ce- ceb cec cee ceg cei ceo cer ces cgb cgc cge cgg cgi cgo cgr cgs ci- cib cic cie cig cii cio cir cis co- cob coc coe cog coi coo cor cos crb crc cre crg cri cro crr crs csb csc cse csg csi cso csr css ebb ebc ebe ebg ebi ebo ebr ebs ec- ecb ecc ece ecg eci eco ecr ecs eeb eec eee eeg eeo eer ees egb egc ege egg egi ego egr egs eib eic eie eig eii eio eir eis eo- eob eoc eoe eog eoi eoo eor eos erb erc ere erg eri ero err ers es- esb esc ese esg esi eso esr ess gbc gbe gbg gbi gbo gbr gbs gcb gcc gce gcg gci gco gcr gcs ge- geb gec gee geg gei geo ger ges ggb ggc ggg ggi ggo ggr ggs gib gic gie gig gii gio gir gis gob goc goe gog goi goo gor gos grb grc gre grg gri gro grr grs gsb gsc gse gsg gsi gso gsr gss ibb ibc ibe ibg ibi ibo ibr ibs icb icc ice icg ici ico icr ics ie- iec iee ieg iei ier ies igb igc ige igg igi igo igr igs iib iic iie iii iio iir iis io- iob ioc ioe iog ioi ioo ior ios ir- irb irc ire irg iri iro irr irs is- isb isc ise isg isi iso isr iss o-i ob- obb obc obe obg obi obo obr obs oc- ocb occ ocg oci oco ocr ocs oeb oec oee oeg oei oeo oer oes ogc oge ogg ogi ogo ogs oib oic oie oii oio oir ois oo- oob ooc oog ooi ooo oor oos or- orb orc ore org ori oro orr ors os- osb osc ose osg osi oso osr oss rbb rbc rbe rbg rbi rbo rbr rbs rcb rcc rce rcg rci rco rcr rcs re- reb rec ree reg rei reo rer res rgb rgc rge rgg rgi rgo rgr rgs rib ric rie rig rii rio rir ris rob roc roe rog roi roo ror ros rrb rrc rrg rri rrr rrs rsb rsc rse rsg rsi rso rsr rss sbb sbc sbe sbg sbi sbo sbr sbs scb scc sce scg sci sco scr scs se- seb sec see seg sei seo ser ses sgb sgc sge sgg sgi sgo sgr sgs sib sic sie sig sii sio sir sis sob soc soe sog soi soo sor sos sr- srb src sre srg sri sro srr srs ss- ssb ssc sse ssg ssi sso ssr sss