-ic b-u bbb bbc bbi bbn bbo bbs bbu bcb bcc bci bcn bco bcs bcu bi- bib bic bii bin bio bis biu bnb bnc bni bnn bno bns bnu bob boc boi bon boo bos bou bsb bsc bsi bsn bso bss bsu bub buc bui bun buo bus buu c-- cbb cbc cbi cbn cbo cbs cbu ccb ccc cci ccn cco ccs ccu ci- cib cic cii cin cio cis ciu cn- cnb cnc cni cnn cno cns cnu co- cob coc coi con coo cos cou csb csc csi csn cso css csu cub cuc cui cun cuo cus cuu ibb ibc ibi ibn ibo ibs ibu icb icc ici icn ico ics icu iib iic iii iin iio iis iiu in- inb inc ini inn ino ins inu io- iob ioc ioi ion ioo ios iou is- isb isc isi isn iso iss isu iu- iub iuc iui ius n-i nbb nbc nbi nbn nbo nbs nbu ncb ncc nci ncn nco ncs ncu nib nic nii nin nio nis niu nnb nnc nni nnn nno nns nnu no- nob noc noi non noo nos nou nsb nsc nsi nsn nso nss nsu nub nuc nui nun nuo nus nuu o-i ob- obb obc obi obn obo obs obu oc- ocb occ oci ocn oco ocs ocu oib oic oii oin oio ois oiu on- onb onc oni onn ono ons onu oo- oob ooc ooi oon ooo oos os- osb osc osi osn oso oss osu ou- ouc oui oun ouo ous sbb sbc sbi sbn sbo sbs sbu scb scc sci scn sco scs scu sib sic sii sin sio sis siu snb snc sni snn sno sns snu sob soc soi son soo sos sou ss- ssb ssc ssi ssn sso sss ssu sub suc sui sun suo sus suu ubb ubc ubi ubn ubo ubs ubu ucb ucc uci ucn uco ucs ucu uib uic uii uin uio uis uiu un- unb unc uni unn uno uns unu uob uoc uon uoo uos usb usc usi usn uso uss usu uuc uun uus uuu