-er bbb bbe bbh bbo bbr be- beb bee beh beo ber bez bhb bhe bhh bho bhr bob boe boh boo bor boz brb bre brh bro brr brz bze bzh bzo bzr bzz ebb ebe ebh ebo ebr eeb eee eeo eer ehb ehe ehh eho ehr eo- eob eoe eoh eoo eor erb ere erh ero err erz eze ezh ezo ezr ezz hbb hbe hbh hbo hbr hbz he- heb hee heh heo her hez hhb hhe hhh hho hhr hhz hob hoe hoh hoo hor hr- hrb hre hrh hro hrr hrz hze hzo ob- obb obe obh obo obr oeb oee oeh oeo oer ohe ohh oho ohr oo- oob ooh ooo oor or- orb ore orh oro orr orz oze ozo ozz rbb rbe rbh rbo rbr re- reb ree reh reo rer rez rh- rhb rhe rhh rho rhr rob roe roh roo ror roz rrb rrh rrr rzb rze rzo zbb zbr zeb zee zeh zeo zer zez zhe zho zhr zo- zob zoe zoo zor zrh zro zzr zzz