-ic bbb bbc bbg bbi bbk bbn bbo bbs bcb bcc bcg bci bck bcn bco bcs bgb bgc bgg bgi bgk bgn bgo bgs bi- bib bic big bii bik bin bio bis bkb bkc bkg bkk bkn bko bks bnb bnc bng bni bnk bnn bno bns bob boc bog boi bok bon boo bos bsb bsc bsg bsi bsk bsn bso bss c-- cbb cbc cbg cbi cbk cbn cbo cbs ccb ccc ccg cci cck ccn cco ccs cgb cgc cgg cgi cgn cgo cgs ci- cib cic cig cii cik cin cio cis ckb ckc cki cko cks cn- cnb cnc cng cni cnn cno cns co- cob coc cog coi cok con coo cos csb csc csg csi csk csn cso css gbc gbg gbi gbk gbn gbo gbs gcb gcc gcg gci gck gcn gco gcs ggb ggc ggg ggi ggn ggo ggs gib gic gig gii gik gin gio gis gkb gkn gko gks gnb gnc gni gnn gno gns gob goc gog goi gok gon goo gos gsb gsc gsg gsi gsk gsn gso gss ibb ibc ibg ibi ibk ibn ibo ibs icb icc icg ici ick icn ico ics igb igc igg igi igk ign igo igs iib iic iii iin iio iis ikb ikc iki ikk iko iks in- inb inc ing ini ink inn ino ins io- iob ioc iog ioi ion ioo ios is- isb isc isg isi isk isn iso iss kbb kbc kbi kbk kbn kbo kbs kcb kcc kcg kci kck kcn kcs kgb kgc kgi kgo kgs kib kic kig kii kik kin kio kis kkb kkc kki kkk kkn kks kn- knc kng kni knk knn kno kob koc kog koi kok kon koo kos ksb ksc ksg ksi ksk ksn kso kss n-i nbb nbc nbg nbi nbk nbn nbo nbs ncb ncc ncg nci nck ncn nco ncs ngb ngc ngg ngi ngk ngn ngo ngs nib nic nig nii nik nin nio nis nkc nki nkk nkn nko nks nnb nnc nng nni nnk nnn nno nns no- nob noc nog noi nok non noo nos nsb nsc nsg nsi nsk nsn nso nss o-i ob- obb obc obg obi obk obn obo obs oc- ocb occ ocg oci ock ocn oco ocs ogc ogg ogi ogn ogo ogs oib oic oii oik oin oio ois okb okc okg oki okk oko oks on- onb onc ong oni onk onn ono ons oo- oob ooc oog ooi ook oon ooo oos os- osb osc osg osi osk osn oso oss sbb sbc sbg sbi sbk sbn sbo sbs scb scc scg sci sck scn sco scs sgb sgc sgg sgi sgk sgn sgo sgs sib sic sig sii sik sin sio sis sk- skb skc skg ski skk sko sks snb snc sng sni snk snn sno sns sob soc sog soi sok son soo sos ss- ssb ssc ssg ssi ssk ssn sso sss