-er bbb bbe bbo bbr bbs bbx be- beb bee beo ber bes bex bjj bjr bjs bob boe boj boo bor bos box brb bre brj bro brr brs brx bsb bse bsj bso bsr bss bsx bxb bxj bxo bxx ebb ebe ebj ebo ebr ebs ebx eeb eee eeo eer ees eex ejo eo- eob eoe eoo eor eos erb ere ero err ers es- esb ese eso esr ess esx ex- exe exo exr exs exx jbj jbo jbr jbs jeb jee jej jeo jer jes jjb jjj jjr jjs job joe joj joo jor jos jrb jro jrr jrs jsb jse jsj jso jsr jss jxs ob- obb obe obj obo obr obs obx oeb oee oeo oer oes oex ojb oje ojo ojs oo- oob ooo oor oos oox or- orb ore oro orr ors orx os- osb ose osj oso osr oss osx ox- oxb oxo oxx rbb rbe rbo rbr rbs rbx re- reb ree reo rer res rex rjr rob roe roj roo ror ros rox rrb rrr rrs rsb rse rsj rso rsr rss rsx rxr rxs sbb sbe sbj sbo sbr sbs sbx se- seb see sej seo ser ses sex sjb sje sjj sjr sjs sob soe soj soo sor sos sox sr- srb sre srj sro srr srs srx ss- ssb sse ssj sso ssr sss ssx sxs xbe xbr xbx xee xer xes xex xjo xjs xoo xor xos xox xrx xsb xss xxo xxx