-er bbb bbe bbi bbk bbn bbo bbr bbt be- beb bee bei bek ben beo ber bet bev bi- bib bie bii bik bin bio bir bit biv bkb bke bkk bkn bko bkr bkt bkv bnb bne bni bnk bnn bno bnr bnt bnv bob boe boi bok bon boo bor bot bov brb bre bri brk brn bro brr brt brv btb bte bti btk btn bto btr btt btv bvb bve bvi bvk bvn bvo bvr bvt bvv ebb ebe ebi ebk ebn ebo ebr ebt ebv eeb eee eek een eeo eer eet eev eib eie eii eik ein eio eir eit eiv ekb eke eki eko ekr ekt ekv en- enb ene eni enk enn eno enr ent env eo- eob eoe eoi eok eon eoo eor eot erb ere eri erk ern ero err ert erv etb ete eti etk etn eto etr ett etv evb eve evi evn evo evr evt evv i-v ibb ibe ibi ibk ibn ibo ibr ibt ibv ie- iee iei iek ien ier iet iev iib iie iii iin iio iir iit ikb ike iki ikk iko ikr ikt ikv in- inb ine ini ink inn ino inr int inv io- iob ioe ioi ion ioo ior iot iov ir- irb ire iri irk irn iro irr irt irv itb ite iti itk itn ito itt itv ivb ive ivi ivo ivr ivt ivv k-t kbb kbe kbi kbk kbn kbo kbr ke- keb kee kei kek ken keo ker ket kev kib kie kii kik kin kio kir kit kiv kkb kke kki kkk kkn kkr kkt kkv kn- kne kni knk knn kno knr knt kob koe koi kok kon koo kor kot kri krk krn kro krr krt krv ktb kte ktk ktn kto ktr ktt ktv kvb kvi kvk kvn kvo kvr kvv n-i nbb nbe nbi nbk nbn nbo nbr nbt nbv ne- neb nee nei nek nen neo ner net nev nib nie nii nik nin nio nir nit niv nke nki nkk nkn nko nkr nkt nnb nne nni nnk nnn nno nnt nnv no- nob noe noi nok non noo nor not nov nrb nre nri nrk nrn nro nrr nrt nrv ntb nte nti ntk ntn nto ntr ntt ntv nvb nve nvi nvk nvn nvt nvv o-i ob- obb obe obi obk obn obo obr obt obv oeb oee oei oen oeo oer oet oib oie oii oik oin oio oir oit oiv okb oke oki okk oko okr on- onb one oni onk onn ono onr ont oo- oob ooi ook oon ooo oor oot oov or- orb ore ori ork orn oro orr ort orv ot- otb ote oti otk otn oto otr ott otv ov- ovb ove ovi ovo ovv rbb rbe rbi rbk rbn rbo rbr rbt re- reb ree rei rek ren reo rer ret rev rib rie rii rik rin rio rir rit riv rkb rke rkk rko rkt rkv rnb rni rnn rno rnr rnt rnv rob roe roi rok ron roo ror rot rov rrb rri rrk rrn rrr rrt rtb rte rti rtk rtn rto rtr rtt rtv rvb rve rvi rvn rvo rvr rvt rvv tbb tbe tbi tbk tbn tbo tbr tbt tbv te- teb tee tei tek ten teo ter tet tev tib tie tii tik tin tio tir tit tiv tkb tke tkk tko tkr tkt tnb tne tni tnk tnn tno tnr tnt to- tob toe toi tok ton too tor tot tov trb tre tri trk trn tro trr trt trv ttb tte tti ttk ttn tto ttr ttt ttv tvb tve tvi tvk tvn tvo tvr tvt v-e vbi vbk vbo vbr vbv veb vee vei vek ven veo ver vet vi- vib vie vii vik vin vio vir vit viv vkb vkt vn- vni vno vnr vnv vob voe voi vok von voo vor vot vov vrb vre vri vrk vrn vrr vrt vtb vte vti vtk vto vtr vtt vtv vvb vvi vvo vvr vvt vvv