-er bbb bbd bbe bbi bbk bbo bbr bbt bdb bdd bde bdi bdk bdo bdr bdt be- beb bed bee bei bek beo ber bet bi- bib bid bie bii bik bio bir bit bkb bke bkk bko bkr bkt bob bod boe boi bok boo bor bot brb brd bre bri brk bro brr brt btb btd bte bti btk bto btr btt dbb dbd dbe dbi dbk dbo dbr dbt ddb ddd dde ddi ddk ddo ddr ddt de- deb ded dee dei dek deo der det di- dib did die dii dik dio dir dit dkb dke dki dkk dko dkr dkt dob dod doe doi dok doo dor dot drb drd dre dri drk dro drr drt dtb dtd dte dti dtk dto dtr dtt ebb ebd ebe ebi ebk ebo ebr ebt ed- edb edd ede edi edk edo edr edt eeb eed eee eek eeo eer eet eib eid eie eii eik eio eir eit ekb ekd eke eki eko ekr ekt eo- eob eod eoe eoi eok eoo eor eot erb erd ere eri erk ero err ert etb etd ete eti etk eto etr ett i-d ibb ibd ibe ibi ibk ibo ibr ibt idb idd ide idi idk ido idr idt ie- ied iee iei iek ier iet iib iid iie iii iio iir iit ikb ike iki ikk iko ikr ikt io- iob iod ioe ioi ioo ior iot ir- irb ird ire iri irk iro irr irt itb itd ite iti itk ito itt k-t kbb kbd kbe kbi kbk kbo kbr kdb kde kdk kdo kdr kdt ke- keb ked kee kei kek keo ker ket kib kid kie kii kik kio kir kit kkb kke kki kkk kkr kkt kob kod koe koi kok koo kor kot krd kri krk kro krr krt ktb kte ktk kto ktr ktt o-i ob- obb obd obe obi obk obo obr obt odb odd ode odi odo odr odt oeb oed oee oei oeo oer oet oib oid oie oii oik oio oir oit okb okd oke oki okk oko okr oo- oob ood ooi ook ooo oor oot or- orb ord ore ori ork oro orr ort ot- otb otd ote oti otk oto otr ott rbb rbd rbe rbi rbk rbo rbr rbt rdb rdd rde rdi rdo rdr rdt re- reb red ree rei rek reo rer ret rib rid rie rii rik rio rir rit rkb rke rkk rko rkt rob rod roe roi rok roo ror rot rrb rrd rri rrk rrr rrt rtb rtd rte rti rtk rto rtr rtt tbb tbd tbe tbi tbk tbo tbr tbt tdb tdd tde tdi tdk tdo tdr tdt te- teb ted tee tei tek teo ter tet tib tid tie tii tik tio tir tit tkb tke tkk tko tkr tkt to- tob tod toe toi tok too tor tot trb trd tre tri trk tro trr trt ttb ttd tte tti ttk tto ttr ttt