-er bbb bbd bbe bbi bbk bbo bbr bdb bdd bde bdi bdk bdo bdr bdv be- beb bed bee bei bek beo ber bev bi- bib bid bie bii bik bio bir biv bkb bke bkk bko bkr bkv bob bod boe boi bok boo bor bov brb brd bre bri brk bro brr brv bvb bvd bve bvi bvk bvo bvr bvv dbb dbd dbe dbi dbk dbo dbr dbv ddb ddd dde ddi ddk ddo ddr de- deb ded dee dei dek deo der dev di- dib did die dii dik dio dir div dkb dke dki dkk dko dkr dob dod doe doi dok doo dor dov drb drd dre dri drk dro drr drv dvb dvd dve dvi dvk dvr ebb ebd ebe ebi ebk ebo ebr ebv ed- edb edd ede edi edk edo edr eeb eed eee eek eeo eer eev eib eid eie eii eik eio eir eiv ekb ekd eke eki eko ekr ekv eo- eob eod eoe eoi eok eoo eor erb erd ere eri erk ero err erv evb evd eve evi evo evr evv i-d i-v ibb ibd ibe ibi ibk ibo ibr ibv idb idd ide idi idk ido idr idv ie- ied iee iei iek ier iev iib iid iie iii iio iir ikb ike iki ikk iko ikr ikv io- iob iod ioe ioi ioo ior iov ir- irb ird ire iri irk iro irr irv ivb ivd ive ivi ivo ivr ivv kbb kbd kbe kbi kbk kbo kbr kdb kde kdk kdo kdr ke- keb ked kee kei kek keo ker kev kib kid kie kii kik kio kir kiv kkb kke kki kkk kkr kkv kob kod koe koi kok koo kor krd kri krk kro krr krv kvb kvi kvk kvo kvr kvv o-i ob- obb obd obe obi obk obo obr obv odb odd ode odi odo odr odv oeb oed oee oei oeo oer oib oid oie oii oik oio oir oiv okb okd oke oki okk oko okr oo- oob ood ooi ook ooo oor oov or- orb ord ore ori ork oro orr orv ov- ovb ovd ove ovi ovo ovv rbb rbd rbe rbi rbk rbo rbr rdb rdd rde rdi rdo rdr rdv re- reb red ree rei rek reo rer rev rib rid rie rii rik rio rir riv rkb rke rkk rko rkv rob rod roe roi rok roo ror rov rrb rrd rri rrk rrr rvb rvd rve rvi rvo rvr rvv v-e vbd vbi vbk vbo vbr vbv vdb vdd vde vdi vdk vdo vdr vdv veb ved vee vei vek veo ver vi- vib vid vie vii vik vio vir viv vkb vob vod voe voi vok voo vor vov vrb vrd vre vri vrk vrr vvb vvi vvo vvr vvv