-er bbb bbe bbr bbs be- beb bee ber bes bjj bjr bjs brb bre brj brr brs bsb bse bsj bsr bss ebb ebe ebj ebr ebs eeb eee eer ees erb ere err ers es- esb ese esr ess jbj jbr jbs jeb jee jej jer jes jjb jjj jjr jjs jrb jrr jrs jsb jse jsj jsr jss rbb rbe rbr rbs re- reb ree rer res rjr rrb rrr rrs rsb rse rsj rsr rss sbb sbe sbj sbr sbs se- seb see sej ser ses sjb sje sjj sjr sjs sr- srb sre srj srr srs ss- ssb sse ssj ssr sss