-ic bbb bbc bbe bbi bbn bbo bbt bcb bcc bce bci bcn bco bct be- beb bec bee bei ben beo bet bi- bib bic bie bii bin bio bit bnb bnc bne bni bnn bno bnt bob boc boe boi bon boo bot btb btc bte bti btn bto btt c-- cbb cbc cbe cbi cbn cbo cbt ccb ccc cce cci ccn cco cct ce- ceb cec cee cei cen ceo cet ci- cib cic cie cii cin cio cit cn- cnb cnc cne cni cnn cno cnt co- cob coc coe coi con coo cot ctb ctc cte cti ctn cto ctt ebb ebc ebe ebi ebn ebo ebt ec- ecb ecc ece eci ecn eco ect eeb eec eee een eeo eet eib eic eie eii ein eio eit en- enb enc ene eni enn eno ent eo- eob eoc eoe eoi eon eoo eot etb etc ete eti etn eto ett ibb ibc ibe ibi ibn ibo ibt icb icc ice ici icn ico ict ie- iec iee iei ien iet iib iic iie iii iin iio iit in- inb inc ine ini inn ino int io- iob ioc ioe ioi ion ioo iot itb itc ite iti itn ito itt n-i nbb nbc nbe nbi nbn nbo nbt ncb ncc nce nci ncn nco nct ne- neb nec nee nei nen neo net nib nic nie nii nin nio nit nnb nnc nne nni nnn nno nnt no- nob noc noe noi non noo not ntb ntc nte nti ntn nto ntt o-i ob- obb obc obe obi obn obo obt oc- ocb occ oci ocn oco oct oeb oec oee oei oen oeo oet oib oic oie oii oin oio oit on- onb onc one oni onn ono ont oo- oob ooc ooi oon ooo oot ot- otb otc ote oti otn oto ott tbb tbc tbe tbi tbn tbo tbt tcb tcc tce tci tcn tco tct te- teb tec tee tei ten teo tet tib tic tie tii tin tio tit tnb tnc tne tni tnn tno tnt to- tob toc toe toi ton too tot ttb ttc tte tti ttn tto ttt