-er bbb bbe bbh bbo bbr bbx be- beb bee beh beo ber bev bex bhb bhe bhh bho bhr bhv bhx bob boe boh boo bor bov box brb bre brh bro brr brv brx bvb bve bvh bvo bvr bvv bxb bxo bxx ebb ebe ebh ebo ebr ebv ebx eeb eee eeo eer eev eex ehb ehe ehh eho ehr ehv eo- eob eoe eoh eoo eor erb ere erh ero err erv evb eve evh evo evr evv ex- exe exh exo exr exx hbb hbe hbh hbo hbr hbv hbx he- heb hee heh heo her hev hex hhb hhe hhh hho hhr hhv hob hoe hoh hoo hor hov hox hr- hrb hre hrh hro hrr hrv hv- hvb hvo hvr hvv hvx ob- obb obe obh obo obr obv obx oeb oee oeh oeo oer oex ohe ohh oho ohr oo- oob ooh ooo oor oov oox or- orb ore orh oro orr orv orx ov- ovb ove ovh ovo ovv ox- oxb oxo oxx rbb rbe rbh rbo rbr rbx re- reb ree reh reo rer rev rex rh- rhb rhe rhh rho rhr rhv rob roe roh roo ror rov rox rrb rrh rrr rvb rve rvh rvo rvr rvv rxr v-e vbh vbo vbr vbv veb vee veh veo ver vex vh- vhb vhe vho vhx vob voe voh voo vor vov vox vrb vre vrh vrr vvb vvo vvr vvv vxr vxv xbe xbr xbx xee xer xev xex xoo xor xov xox xrx xvh xxo xxv xxx