-ic bbb bbc bbi bbn bbo bbs bcb bcc bci bcn bco bcs bi- bib bic bii bin bio bis bnb bnc bni bnn bno bns bob boc boi bon boo bos bsb bsc bsi bsn bso bss c-- cbb cbc cbi cbn cbo cbs ccb ccc cci ccn cco ccs ci- cib cic cii cin cio cis cn- cnb cnc cni cnn cno cns co- cob coc coi con coo cos csb csc csi csn cso css ibb ibc ibi ibn ibo ibs icb icc ici icn ico ics iib iic iii iin iio iis in- inb inc ini inn ino ins io- iob ioc ioi ion ioo ios is- isb isc isi isn iso iss n-i nbb nbc nbi nbn nbo nbs ncb ncc nci ncn nco ncs nib nic nii nin nio nis nnb nnc nni nnn nno nns no- nob noc noi non noo nos nsb nsc nsi nsn nso nss o-i ob- obb obc obi obn obo obs oc- ocb occ oci ocn oco ocs oib oic oii oin oio ois on- onb onc oni onn ono ons oo- oob ooc ooi oon ooo oos os- osb osc osi osn oso oss sbb sbc sbi sbn sbo sbs scb scc sci scn sco scs sib sic sii sin sio sis snb snc sni snn sno sns sob soc soi son soo sos ss- ssb ssc ssi ssn sso sss