-er -ic bbb bbc bbe bbg bbi bbo bbr bbs bbx bcb bcc bce bcg bci bco bcr bcs bcx be- beb bec bee beg bei beo ber bes bex bgb bgc bge bgg bgi bgo bgr bgs bgx bi- bib bic bie big bii bio bir bis bix bob boc boe bog boi boo bor bos box brb bre brg bri bro brr brs brx bsb bsc bse bsg bsi bso bsr bss bsx bxb bxi bxo bxx c-- cbb cbc cbe cbg cbi cbo cbr cbs cbx ccb ccc cce ccg cci cco ccr ccs ccx ce- ceb cec cee ceg cei ceo cer ces cex cgb cgc cge cgg cgi cgo cgr cgs ci- cib cic cie cig cii cio cir cis cix co- cob coc coe cog coi coo cor cos cox crb crc cre crg cri cro crr crs crx csb csc cse csg csi cso csr css csx cxc cxi cxo cxr cxs cxx ebb ebc ebe ebg ebi ebo ebr ebs ebx ec- ecb ecc ece ecg eci eco ecr ecs ecx eeb eec eee eeg eeo eer ees eex egb egc ege egg egi ego egr egs egx eib eic eie eig eii eio eir eis eix 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 esx ex- exc exe exi exo exr exs exx gbc gbe gbg gbi gbo gbr gbs gbx gcb gcc gce gcg gci gco gcr gcs ge- geb gec gee geg gei geo ger ges gex ggb ggc ggg ggi ggo ggr ggs gib gic gie gig gii gio gir gis gob goc goe gog goi goo gor gos gox grb grc gre grg gri gro grr grs grx gsb gsc gse gsg gsi gso gsr gss gsx gxs ibb ibc ibe ibg ibi ibo ibr ibs ibx icb icc ice icg ici ico icr ics ie- iec iee ieg iei ier ies iex igb igc ige igg igi igo igr igs iib iic iie iii iio iir iis iix io- iob ioc ioe iog ioi ioo ior ios ir- irb irc ire irg iri iro irr irs irx is- isb isc ise isg isi iso isr iss ixc ixe ixi o-i ob- obb obc obe obg obi obo obr obs obx oc- ocb occ ocg oci oco ocr ocs ocx oeb oec oee oeg oei oeo oer oes oex ogc oge ogg ogi ogo ogs ogx oib oic oie oii oio oir ois oo- oob ooc oog ooi ooo oor oos oox or- orb orc ore org ori oro orr ors orx os- osb osc ose osg osi oso osr oss osx ox- oxb oxc oxi oxo oxx rbb rbc rbe rbg rbi rbo rbr rbs rbx rcb rcc rce rcg rci rco rcr rcs rcx re- reb rec ree reg rei reo rer res rex rgb rgc rge rgg rgi rgo rgr rgs rgx rib ric rie rig rii rio rir ris rix rob roc roe rog roi roo ror ros rox rrb rrc rrg rri rrr rrs rsb rsc rse rsg rsi rso rsr rss rsx rxr rxs sbb sbc sbe sbg sbi sbo sbr sbs sbx scb scc sce scg sci sco scr scs scx se- seb sec see seg sei seo ser ses sex sgb sgc sge sgg sgi sgo sgr sgs sgx sib sic sie sig sii sio sir sis six sob soc soe sog soi soo sor sos sox sr- srb src sre srg sri sro srr srs srx ss- ssb ssc sse ssg ssi sso ssr sss ssx sxc sxi sxs xbc xbe xbr xbx xcb xci xcr xcx xee xeg xer xes xex xge xgi xic xie xii xio xis xix xoc xog xoi xoo xor xos xox xrc xrx xsb xsc xsi xss xxi xxo xxx