-ic bbb bbc bbi bbn bbo bbt bcb bcc bci bcn bco bct bi- bib bic bii bin bio bit bnb bnc bni bnn bno bnt bob boc boi bon boo bot btb btc bti btn bto btt c-- cbb cbc cbi cbn cbo cbt ccb ccc cci ccn cco cct ci- cib cic cii cin cio cit cn- cnb cnc cni cnn cno cnt co- cob coc coi con coo cot ctb ctc cti ctn cto ctt ibb ibc ibi ibn ibo ibt icb icc ici icn ico ict iib iic iii iin iio iit in- inb inc ini inn ino int io- iob ioc ioi ion ioo iot itb itc iti itn ito itt n-i nbb nbc nbi nbn nbo nbt ncb ncc nci ncn nco nct nib nic nii nin nio nit nnb nnc nni nnn nno nnt no- nob noc noi non noo not ntb ntc nti ntn nto ntt o-i ob- obb obc obi obn obo obt oc- ocb occ oci ocn oco oct oib oic oii oin oio oit on- onb onc oni onn ono ont oo- oob ooc ooi oon ooo oot ot- otb otc oti otn oto ott tbb tbc tbi tbn tbo tbt tcb tcc tci tcn tco tct tib tic tii tin tio tit tnb tnc tni tnn tno tnt to- tob toc toi ton too tot ttb ttc tti ttn tto ttt