-er bbb bbd bbe bbg bbo bbr bdb bdd bde bdg bdo bdr be- beb bed bee beg beo ber bgb bgd bge bgg bgo bgr bob bod boe bog boo bor brb brd bre brg bro brr dbb dbd dbe dbg dbo dbr ddb ddd dde ddg ddo ddr de- deb ded dee deg deo der dgd dge dgg dgr dob dod doe dog doo dor drb drd dre drg dro drr ebb ebd ebe ebg ebo ebr ed- edb edd ede edg edo edr eeb eed eee eeg eeo eer egb egd ege egg ego egr eo- eob eod eoe eog eoo eor erb erd ere erg ero err g-d gbd gbe gbg gbo gbr gdb gdd gde gdo gdr ge- geb ged gee geg geo ger ggb ggd ggg ggo ggr gob god goe gog goo gor grb grd gre grg gro grr ob- obb obd obe obg obo obr odb odd ode odg odo odr oeb oed oee oeg oeo oer ogd oge ogg ogo oo- oob ood oog ooo oor or- orb ord ore org oro orr rbb rbd rbe rbg rbo rbr rdb rdd rde rdg rdo rdr re- reb red ree reg reo rer rgb rgd rge rgg rgo rgr rob rod roe rog roo ror rrb rrd rrg rrr