-er bbb bbd bbe bbg bbk bbo bbr bdb bdd bde bdg bdk bdo bdr be- beb bed bee beg bek beo ber bgb bgd bge bgg bgk bgo bgr bkb bke bkg bkk bko bkr bob bod boe bog bok boo bor brb brd bre brg brk bro brr dbb dbd dbe dbg dbk dbo dbr ddb ddd dde ddg ddk ddo ddr de- deb ded dee deg dek deo der dgd dge dgg dgk dgr dkb dke dkg dkk dko dkr dob dod doe dog dok doo dor drb drd dre drg drk dro drr ebb ebd ebe ebg ebk ebo ebr ed- edb edd ede edg edk edo edr eeb eed eee eeg eek eeo eer egb egd ege egg ego egr ekb ekd eke ekg eko ekr eo- eob eod eoe eog eok eoo eor erb erd ere erg erk ero err g-d gbd gbe gbg gbk gbo gbr gdb gdd gde gdk gdo gdr ge- geb ged gee geg gek geo ger ggb ggd ggg ggo ggr gkb gkd gko gob god goe gog gok goo gor grb grd gre grg grk gro grr kbb kbd kbe kbk kbo kbr kdb kde kdg kdk kdo kdr ke- keb ked kee keg kek keo ker kgb kgd kgo kkb kke kkk kkr kob kod koe kog kok koo kor krd krg krk kro krr ob- obb obd obe obg obk obo obr odb odd ode odg odo odr oeb oed oee oeg oeo oer ogd oge ogg ogo okb okd oke okg okk oko okr oo- oob ood oog ook ooo oor or- orb ord ore org ork oro orr rbb rbd rbe rbg rbk rbo rbr rdb rdd rde rdg rdo rdr re- reb red ree reg rek reo rer rgb rgd rge rgg rgk rgo rgr rkb rke rkg rkk rko rob rod roe rog rok roo ror rrb rrd rrg rrk rrr