-ic bbb bbc bbf bbi bbk bbn bbo bbt bcb bcc bcf bci bck bcn bco bct bfb bfc bff bfi bfn bfo bft bi- bib bic bif bii bik bin bio bit bkb bkc bkf bkk bkn bko bkt bnb bnc bnf bni bnk bnn bno bnt bob boc bof boi bok bon boo bot btb btc btf bti btk btn bto btt c-- cbb cbc cbf cbi cbk cbn cbo cbt ccb ccc ccf cci cck ccn cco cct cfb cfc cff cfi cfk cfn cfo cft ci- cib cic cif cii cik cin cio cit ckb ckc cki cko ckt cn- cnb cnc cnf cni cnn cno cnt co- cob coc cof coi cok con coo cot ctb ctc ctf cti ctk ctn cto ctt fbb fbc fbf fbi fbk fbn fbo fbt fcb fcc fcf fci fck fcn fco fct ffc fff ffi ffk ffn ffo fft fib fic fif fii fik fin fit fkb fkc fkf fki fkk fkt fnb fnc fnf fni fnk fnn fnt fob foc fof foi fok fon foo fot ftb ftc ftf fti ftk ftn fto ftt i-f ibb ibc ibf ibi ibk ibn ibo ibt icb icc icf ici ick icn ico ict ifb ifc iff ifi ifn ifo ift iib iic iif iii iin iio iit ikb ikc ikf iki ikk iko ikt in- inb inc inf ini ink inn ino int io- iob ioc iof ioi ion ioo iot itb itc itf iti itk itn ito itt k-t kbb kbc kbf kbi kbk kbn kbo kcb kcc kci kck kcn kct kfc kff kfi kfo kib kic kif kii kik kin kio kit kkb kkc kki kkk kkn kkt kn- knc knf kni knk knn kno knt kob koc kof koi kok kon koo kot ktb ktc ktf ktk ktn kto ktt n-i nbb nbc nbf nbi nbk nbn nbo nbt ncb ncc ncf nci nck ncn nco nct nfb nfc nff nfi nfk nfn nfo nft nib nic nif nii nik nin nio nit nkc nkf nki nkk nkn nko nkt nnb nnc nnf nni nnk nnn nno nnt no- nob noc nof noi nok non noo not ntb ntc ntf nti ntk ntn nto ntt o-i ob- obb obc obf obi obk obn obo obt oc- ocb occ ocf oci ock ocn oco oct of- ofb ofc off ofi ofn ofo oft oib oic oif oii oik oin oio oit okb okc oki okk oko on- onb onc onf oni onk onn ono ont oo- oob ooc oof ooi ook oon ooo oot ot- otb otc otf oti otk otn oto ott tbb tbc tbf tbi tbk tbn tbo tbt tcb tcc tcf tci tck tcn tco tct tfb tfc tff tfi tfk tfn tfo tft tib tic tif tii tik tin tio tit tkb tkc tkk tko tkt tnb tnc tnf tni tnk tnn tno tnt to- tob toc tof toi tok ton too tot ttb ttc ttf tti ttk ttn tto ttt