-ic bbb bbc bbi bbn bbo bbr bbt bcb bcc bci bcn bco bcr bct bcz bi- bib bic bii bin bio bir bit biz bnb bnc bni bnn bno bnr bnt bnz bob boc boi bon boo bor bot boz brb bri brn bro brr brt brz btb btc bti btn bto btr btt btz bzn bzo bzr bzz c-- cbb cbc cbi cbn cbo cbr cbt cbz ccb ccc cci ccn cco ccr cct ccz ci- cib cic cii cin cio cir cit cn- cnb cnc cni cnn cno cnr cnt co- cob coc coi con coo cor cot coz crb crc cri crn cro crr crt crz ctb ctc cti ctn cto ctr ctt ctz cz- czc czo czt ibb ibc ibi ibn ibo ibr ibt ibz icb icc ici icn ico icr ict icz 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 itz izi izo izz n-i nbb nbc nbi nbn nbo nbr nbt ncb ncc nci ncn nco ncr nct nib nic nii nin nio nir nit niz nnb nnc nni nnn nno nnt nnz no- nob noc noi non noo nor not noz nrb nrc nri nrn nro nrr nrt nrz ntb ntc nti ntn nto ntr ntt ntz nzb nzi nzo nzz o-i ob- obb obc obi obn obo obr obt oc- ocb occ oci ocn oco ocr oct ocz oib oic oii oin oio oir oit oiz on- onb onc oni onn ono onr ont oo- oob ooc ooi oon ooo oor oot or- orb orc ori orn oro orr ort orz ot- otb otc oti otn oto otr ott otz ozo ozt ozz rbb rbc rbi rbn rbo rbr rbt rcb rcc rci rcn rco rcr rct rib ric rii rin rio rir rit riz rnb rnc rni rnn rno rnr rnt rnz rob roc roi ron roo ror rot roz rrb rrc rri rrn rrr rrt rtb rtc rti rtn rto rtr rtt rtz rzb rzo tbb tbc tbi tbn tbo tbr tbt tbz tcb tcc tci tcn tco tcr tct tib tic tii tin tio tir tit tiz tnb tnc tni tnn tno tnr tnt tnz to- tob toc toi ton too tor tot toz trb trc tri trn tro trr trt trz ttb ttc tti ttn tto ttr ttt zbb zbc zbr zbt zco zib zin zio zir zit ziz znc znn zno zo- zob zoc zoi zon zoo zor zot zro ztr zzr zzt zzz