-ic bbb bbc bbi bbn bbo bbs bbt bby bcb bcc bci bcn bco bcs bct bcy bi- bib bic bii bin bio bis bit biy bnb bnc bni bnn bno bns bnt bob boc boi bon boo bos bot boy bsb bsc bsi bsn bso bss bst bsy btb btc bti btn bto bts btt bty by- byc byi byn byo bys byt c-- cbb cbc cbi cbn cbo cbs cbt cby ccb ccc cci ccn cco ccs cct ci- cib cic cii cin cio cis cit cn- cnb cnc cni cnn cno cns cnt cny co- cob coc coi con coo cos cot coy csb csc csi csn cso css cst csy ctb ctc cti ctn cto cts ctt cty cyb cyc cyn cyo cys cyt ibb ibc ibi ibn ibo ibs ibt iby icb icc ici icn ico ics ict icy iib iic iii iin iio iis iit in- inb inc ini inn ino ins int iny io- iob ioc ioi ion ioo ios iot is- isb isc isi isn iso iss ist isy itb itc iti itn ito its itt ity iyc iyo iys iyt iyy n-i nbb nbc nbi nbn nbo nbs nbt ncb ncc nci ncn nco ncs nct nib nic nii nin nio nis nit nnb nnc nni nnn nno nns nnt no- nob noc noi non noo nos not noy nsb nsc nsi nsn nso nss nst nsy ntb ntc nti ntn nto nts ntt nyc nyn nyo nys nyt nyy o-i ob- obb obc obi obn obo obs obt oby oc- ocb occ oci ocn oco ocs oct oib oic oii oin oio ois oit on- onb onc oni onn ono ons ont ony oo- oob ooc ooi oon ooo oos oot os- osb osc osi osn oso oss ost ot- otb otc oti otn oto ots ott oyi oyo oys sbb sbc sbi sbn sbo sbs sbt sby scb scc sci scn sco scs sct sib sic sii sin sio sis sit snb snc sni snn sno sns snt sny sob soc soi son soo sos sot soy ss- ssb ssc ssi ssn sso sss sst stb stc sti stn sto sts stt sty sy- syb syc syi syn sys syt tbb tbc tbi tbn tbo tbs tbt tcb tcc tci tcn tco tcs tct tib tic tii tin tio tis tit tiy tnb tnc tni tnn tno tns tnt to- tob toc toi ton too tos tot toy tsb tsc tsi tsn tso tss tst tsy ttb ttc tti ttn tto tts ttt tty tyc tyn tyo tys tyt ybc ybi ybs yby ycc yci yco ycs ycy yii yin yio yis yit ynn yns yny yob yoc yoi yon yoo yos yot yoy ysb ysc ysi yso yss yst ysy ytc ytn yto yts ytt yyb yyc yys yyt yyy