bbb bbe bbk bbn bbo bbt bbx be- beb bee bek ben beo bet bex bkb bke bkk bkn bko bkt bkx bnb bne bnk bnn bno bnt bnx bob boe bok bon boo bot box btb bte btk btn bto btt btx bxb bxn bxo bxx ebb ebe ebk ebn ebo ebt ebx eeb eee eek een eeo eet eex ekb eke eko ekt en- enb ene enk enn eno ent eo- eob eoe eok eon eoo eot etb ete etk etn eto ett etx ex- exe exo ext exx k-t kbb kbe kbk kbn kbo kbx ke- keb kee kek ken keo ket kex kkb kke kkk kkn kkt kn- kne knk knn kno knt knx kob koe kok kon koo kot ktb kte ktk ktn kto ktt kxo nbb nbe nbk nbn nbo nbt nbx ne- neb nee nek nen neo net nex nke nkk nkn nko nkt nnb nne nnk nnn nno nnt no- nob noe nok non noo not nox ntb nte ntk ntn nto ntt ntx nxt ob- obb obe obk obn obo obt obx oeb oee oen oeo oet oex okb oke okk oko on- onb one onk onn ono ont onx oo- oob ook oon ooo oot oox ot- otb ote otk otn oto ott ox- oxb oxn oxo oxt oxx t-x tbb tbe tbk tbn tbo tbt te- teb tee tek ten teo tet tex tkb tke tkk tko tkt tnb tne tnk tnn tno tnt tnx to- tob toe tok ton too tot tox ttb tte ttk ttn tto ttt ttx txe txk txn txt xbe xbx xee xen xet xex xkb xke xnk xno xok xon xoo xot xox xtx xxo xxx