bbb bbd bbe bbk bbo bbt bdb bdd bde bdk bdo bdt be- beb bed bee bek beo bet bkb bke bkk bko bkt bob bod boe bok boo bot btb btd bte btk bto btt dbb dbd dbe dbk dbo dbt ddb ddd dde ddk ddo ddt de- deb ded dee dek deo det dkb dke dkk dko dkt dob dod doe dok doo dot dtb dtd dte dtk dto dtt ebb ebd ebe ebk ebo ebt ed- edb edd ede edk edo edt eeb eed eee eek eeo eet ekb ekd eke eko ekt eo- eob eod eoe eok eoo eot etb etd ete etk eto ett k-t kbb kbd kbe kbk kbo kdb kde kdk kdo kdt ke- keb ked kee kek keo ket kkb kke kkk kkt kob kod koe kok koo kot ktb kte ktk kto ktt ob- obb obd obe obk obo obt odb odd ode odo odt oeb oed oee oeo oet okb okd oke okk oko oo- oob ood ook ooo oot ot- otb otd ote otk oto ott tbb tbd tbe tbk tbo tbt tdb tdd tde tdk tdo tdt te- teb ted tee tek teo tet tkb tke tkk tko tkt to- tob tod toe tok too tot ttb ttd tte ttk tto ttt