-er bbb bbe bbo bbr bbt be- beb bee beo ber bet bjj bjr bjt bob boe boj boo bor bot brb bre brj bro brr brt btb bte bto btr btt ebb ebe ebj ebo ebr ebt eeb eee eeo eer eet ejo ejt eo- eob eoe eoo eor eot erb ere ero err ert etb ete etj eto etr ett jbj jbo jbr jbt jeb jee jej jeo jer jet jjb jjj jjr job joe joj joo jor jot jrb jro jrr jrt jtb jte jtr jtt ob- obb obe obj obo obr obt oeb oee oeo oer oet ojb oje ojo oo- oob ooo oor oot or- orb ore oro orr ort ot- otb ote oto otr ott rbb rbe rbo rbr rbt re- reb ree reo rer ret rjr rob roe roj roo ror rot rrb rrr rrt rtb rte rtj rto rtr rtt tbb tbe tbj tbo tbr tbt te- teb tee tej teo ter tet tje tjo tjr to- tob toe toj too tor tot trb tre tro trr trt ttb tte tto ttr ttt