-er -ic bbb bbc bbe bbg bbi bbo bbr bcb bcc bce bcg bci bco bcr be- beb bec bee beg bei beo ber bgb bgc bge bgg bgi bgo bgr bi- bib bic bie big bii bio bir bob boc boe bog boi boo bor brb bre brg bri bro brr c-- cbb cbc cbe cbg cbi cbo cbr ccb ccc cce ccg cci cco ccr ce- ceb cec cee ceg cei ceo cer cgb cgc cge cgg cgi cgo cgr ci- cib cic cie cig cii cio cir co- cob coc coe cog coi coo cor crb crc cre crg cri cro crr ebb ebc ebe ebg ebi ebo ebr ec- ecb ecc ece ecg eci eco ecr eeb eec eee eeg eeo eer egb egc ege egg egi ego egr eib eic eie eig eii eio eir eo- eob eoc eoe eog eoi eoo eor erb erc ere erg eri ero err gbc gbe gbg gbi gbo gbr gcb gcc gce gcg gci gco gcr ge- geb gec gee geg gei geo ger ggb ggc ggg ggi ggo ggr gib gic gie gig gii gio gir gob goc goe gog goi goo gor grb grc gre grg gri gro grr ibb ibc ibe ibg ibi ibo ibr icb icc ice icg ici ico icr ie- iec iee ieg iei ier igb igc ige igg igi igo igr iib iic iie iii iio iir io- iob ioc ioe iog ioi ioo ior ir- irb irc ire irg iri iro irr o-i ob- obb obc obe obg obi obo obr oc- ocb occ ocg oci oco ocr oeb oec oee oeg oei oeo oer ogc oge ogg ogi ogo oib oic oie oii oio oir oo- oob ooc oog ooi ooo oor or- orb orc ore org ori oro orr rbb rbc rbe rbg rbi rbo rbr rcb rcc rce rcg rci rco rcr re- reb rec ree reg rei reo rer rgb rgc rge rgg rgi rgo rgr rib ric rie rig rii rio rir rob roc roe rog roi roo ror rrb rrc rrg rri rrr