-er bbb bbe bbg bbi bbo bbr bbt be- beb bee beg bei beo ber bet bgb bge bgg bgi bgo bgr bgt bi- bib bie big bii bio bir bit bob boe bog boi boo bor bot brb bre brg bri bro brr brt btb bte btg bti bto btr btt ebb ebe ebg ebi ebo ebr ebt eeb eee eeg eeo eer eet egb ege egg egi ego egr egt eib eie eig eii eio eir eit eo- eob eoe eog eoi eoo eor eot erb ere erg eri ero err ert etb ete etg eti eto etr ett gbe gbg gbi gbo gbr gbt ge- geb gee geg gei geo ger get ggb ggg ggi ggo ggr ggt gib gie gig gii gio gir git gob goe gog goi goo gor got grb gre grg gri gro grr grt gtb gte gtg gti gto gtr gtt ibb ibe ibg ibi ibo ibr ibt ie- iee ieg iei ier iet igb ige igg igi igo igr igt iib iie iii iio iir iit io- iob ioe iog ioi ioo ior iot ir- irb ire irg iri iro irr irt itb ite itg iti ito itt o-i ob- obb obe obg obi obo obr obt oeb oee oeg oei oeo oer oet oge ogg ogi ogo ogt oib oie oii oio oir oit oo- oob oog ooi ooo oor oot or- orb ore org ori oro orr ort ot- otb ote otg oti oto otr ott rbb rbe rbg rbi rbo rbr rbt re- reb ree reg rei reo rer ret rgb rge rgg rgi rgo rgr rgt rib rie rig rii rio rir rit rob roe rog roi roo ror rot rrb rrg rri rrr rrt rtb rte rtg rti rto rtr rtt tbb tbe tbg tbi tbo tbr tbt te- teb tee teg tei teo ter tet tgb tge tgg tgi tgo tgr tgt tib tie tig tii tio tir tit to- tob toe tog toi too tor tot trb tre trg tri tro trr trt ttb tte ttg tti tto ttr ttt