-er -ic bbb bbc bbe bbg bbi bbo bbr bbx bcb bcc bce bcg bci bco bcr bcx be- beb bec bee beg bei beo ber bex bgb bgc bge bgg bgi bgo bgr bgx bi- bib bic bie big bii bio bir bix bob boc boe bog boi boo bor box brb bre brg bri bro brr brx bxb bxi bxo bxx c-- cbb cbc cbe cbg cbi cbo cbr cbx ccb ccc cce ccg cci cco ccr ccx ce- ceb cec cee ceg cei ceo cer cex cgb cgc cge cgg cgi cgo cgr ci- cib cic cie cig cii cio cir cix co- cob coc coe cog coi coo cor cox crb crc cre crg cri cro crr crx cxc cxi cxo cxr cxx ebb ebc ebe ebg ebi ebo ebr ebx ec- ecb ecc ece ecg eci eco ecr ecx eeb eec eee eeg eeo eer eex egb egc ege egg egi ego egr egx eib eic eie eig eii eio eir eix eo- eob eoc eoe eog eoi eoo eor erb erc ere erg eri ero err ex- exc exe exi exo exr exx gbc gbe gbg gbi gbo gbr gbx gcb gcc gce gcg gci gco gcr ge- geb gec gee geg gei geo ger gex ggb ggc ggg ggi ggo ggr gib gic gie gig gii gio gir gob goc goe gog goi goo gor gox grb grc gre grg gri gro grr grx ibb ibc ibe ibg ibi ibo ibr ibx icb icc ice icg ici ico icr ie- iec iee ieg iei ier iex igb igc ige igg igi igo igr iib iic iie iii iio iir iix io- iob ioc ioe iog ioi ioo ior ir- irb irc ire irg iri iro irr irx ixc ixe ixi o-i ob- obb obc obe obg obi obo obr obx oc- ocb occ ocg oci oco ocr ocx oeb oec oee oeg oei oeo oer oex ogc oge ogg ogi ogo ogx oib oic oie oii oio oir oo- oob ooc oog ooi ooo oor oox or- orb orc ore org ori oro orr orx ox- oxb oxc oxi oxo oxx rbb rbc rbe rbg rbi rbo rbr rbx rcb rcc rce rcg rci rco rcr rcx re- reb rec ree reg rei reo rer rex rgb rgc rge rgg rgi rgo rgr rgx rib ric rie rig rii rio rir rix rob roc roe rog roi roo ror rox rrb rrc rrg rri rrr rxr xbc xbe xbr xbx xcb xci xcr xcx xee xeg xer xex xge xgi xic xie xii xio xix xoc xog xoi xoo xor xox xrc xrx xxi xxo xxx