-er bbb bbe bbk bbo bbr bbt bbw be- beb bee bek beo ber bet bew bkb bke bkk bko bkr bkt bkw bob boe bok boo bor bot bow brb bre brk bro brr brt brw btb bte btk bto btr btt btw bwb bwk bwo bwr ebb ebe ebk ebo ebr ebt ebw eeb eee eek eeo eer eet eew ekb eke eko ekr ekt eo- eob eoe eok eoo eor eot eow erb ere erk ero err ert erw etb ete etk eto etr ett etw ewb ewe ewk ewo ewr ewt eww k-t kbb kbe kbk kbo kbr kbw ke- keb kee kek keo ker ket kew kkb kke kkk kkr kkt kob koe kok koo kor kot kow krk kro krr krt krw ktb kte ktk kto ktr ktt ktw kw- kwk kwo kwt kww ob- obb obe obk obo obr obt obw oeb oee oeo oer oet okb oke okk oko okr okw oo- oob ook ooo oor oot oow or- orb ore ork oro orr ort ot- otb ote otk oto otr ott otw owb owe owk owo owt oww rbb rbe rbk rbo rbr rbt rbw re- reb ree rek reo rer ret rew rkb rke rkk rko rkt rob roe rok roo ror rot row rrb rrk rrr rrt rtb rte rtk rto rtr rtt rtw rwb rwe rwr tbb tbe tbk tbo tbr tbt te- teb tee tek teo ter tet tew tkb tke tkk tko tkr tkt tkw to- tob toe tok too tor tot tow trb tre trk tro trr trt trw ttb tte ttk tto ttr ttt ttw twb twe two twr twt tww wbb wbe wbo wbr wbt wbw web wee wek weo wer wet wew wkb wke wko wkr wkt wkw wob woe wok woo wor wot wow wr- wre wrk wro wrr wrt wrw wtb wto wtr wtt wtw wwe wwo wwt www