-er bbb bbe bbi bbk bbn bbo bbr bbt be- beb bee bei bek ben beo ber bet bi- bib bie bii bik bin bio bir bit bkb bke bkk bkn bko bkr bkt bnb bne bni bnk bnn bno bnr bnt bob boe boi bok bon boo bor bot brb bre bri brk brn bro brr brt btb bte bti btk btn bto btr btt ebb ebe ebi ebk ebn ebo ebr ebt eeb eee eek een eeo eer eet eib eie eii eik ein eio eir eit ekb eke eki eko ekr ekt en- enb ene eni enk enn eno enr ent eo- eob eoe eoi eok eon eoo eor eot erb ere eri erk ern ero err ert etb ete eti etk etn eto etr ett ibb ibe ibi ibk ibn ibo ibr ibt ie- iee iei iek ien ier iet iib iie iii iin iio iir iit ikb ike iki ikk iko ikr ikt in- inb ine ini ink inn ino inr int io- iob ioe ioi ion ioo ior iot ir- irb ire iri irk irn iro irr irt itb ite iti itk itn ito itt k-t kbb kbe kbi kbk kbn kbo kbr ke- keb kee kei kek ken keo ker ket kib kie kii kik kin kio kir kit kkb kke kki kkk kkn kkr kkt kn- kne kni knk knn kno knr knt kob koe koi kok kon koo kor kot kri krk krn kro krr krt ktb kte ktk ktn kto ktr ktt n-i nbb nbe nbi nbk nbn nbo nbr nbt ne- neb nee nei nek nen neo ner net nib nie nii nik nin nio nir nit nke nki nkk nkn nko nkr nkt nnb nne nni nnk nnn nno nnt no- nob noe noi nok non noo nor not nrb nre nri nrk nrn nro nrr nrt ntb nte nti ntk ntn nto ntr ntt o-i ob- obb obe obi obk obn obo obr obt oeb oee oei oen oeo oer oet oib oie oii oik oin oio oir oit okb oke oki okk oko okr on- onb one oni onk onn ono onr ont oo- oob ooi ook oon ooo oor oot or- orb ore ori ork orn oro orr ort ot- otb ote oti otk otn oto otr ott rbb rbe rbi rbk rbn rbo rbr rbt re- reb ree rei rek ren reo rer ret rib rie rii rik rin rio rir rit rkb rke rkk rko rkt rnb rni rnn rno rnr rnt rob roe roi rok ron roo ror rot rrb rri rrk rrn rrr rrt rtb rte rti rtk rtn rto rtr rtt tbb tbe tbi tbk tbn tbo tbr tbt te- teb tee tei tek ten teo ter tet tib tie tii tik tin tio tir tit tkb tke tkk tko tkr tkt tnb tne tni tnk tnn tno tnr tnt to- tob toe toi tok ton too tor tot trb tre tri trk trn tro trr trt ttb tte tti ttk ttn tto ttr ttt