-ic bbb bbc bbi bbn bbo bbr bbt bcb bcc bci bcn bco bcr bct bi- bib bic bii bin bio bir bit bnb bnc bni bnn bno bnr bnt bob boc boi bon boo bor bot brb bri brn bro brr brt btb btc bti btn bto btr btt c-- cbb cbc cbi cbn cbo cbr cbt ccb ccc cci ccn cco ccr cct ci- cib cic cii cin cio cir cit cn- cnb cnc cni cnn cno cnr cnt co- cob coc coi con coo cor cot crb crc cri crn cro crr crt ctb ctc cti ctn cto ctr ctt ibb ibc ibi ibn ibo ibr ibt icb icc ici icn ico icr ict iib iic iii iin iio iir iit in- inb inc ini inn ino inr int io- iob ioc ioi ion ioo ior iot ir- irb irc iri irn iro irr irt itb itc iti itn ito itt n-i nbb nbc nbi nbn nbo nbr nbt ncb ncc nci ncn nco ncr nct nib nic nii nin nio nir nit nnb nnc nni nnn nno nnt no- nob noc noi non noo nor not nrb nrc nri nrn nro nrr nrt ntb ntc nti ntn nto ntr ntt o-i ob- obb obc obi obn obo obr obt oc- ocb occ oci ocn oco ocr oct oib oic oii oin oio oir oit on- onb onc oni onn ono onr ont oo- oob ooc ooi oon ooo oor oot or- orb orc ori orn oro orr ort ot- otb otc oti otn oto otr ott rbb rbc rbi rbn rbo rbr rbt rcb rcc rci rcn rco rcr rct rib ric rii rin rio rir rit rnb rnc rni rnn rno rnr rnt rob roc roi ron roo ror rot rrb rrc rri rrn rrr rrt rtb rtc rti rtn rto rtr rtt tbb tbc tbi tbn tbo tbr tbt tcb tcc tci tcn tco tcr tct tib tic tii tin tio tir tit tnb tnc tni tnn tno tnr tnt to- tob toc toi ton too tor tot trb trc tri trn tro trr trt ttb ttc tti ttn tto ttr ttt