-ic c-- ccc ccf cci cck cco ccs cfc cff cfi cfk cfo cfs ci- cic cif cii cik cio cis ckc cki cko cks co- coc cof coi cok coo cos csc csf csi csk cso css fcc fcf fci fck fco fcs ffc fff ffi ffk ffo ffs fic fif fii fik fis fkc fkf fki fkk foc fof foi fok foo fos fsc fsf fsi fsk fso fss i-f icc icf ici ick ico ics ifc iff ifi ifo ifs iic iif iii iio iis ikc ikf iki ikk iko iks io- ioc iof ioi ioo ios is- isc isf isi isk iso iss kcc kci kck kcs kfc kff kfi kfo kfs kic kif kii kik kio kis kkc kki kkk kks koc kof koi kok koo kos ksc ksf ksi ksk kso kss o-i oc- occ ocf oci ock oco ocs of- ofc off ofi ofo ofs oic oif oii oik oio ois okc oki okk oko oks oo- ooc oof ooi ook ooo oos os- osc osf osi osk oso oss scc scf sci sck sco scs sfc sff sfi sfk sfo sfs sic sif sii sik sio sis sk- skc skf ski skk sko sks soc sof soi sok soo sos ss- ssc ssf ssi ssk sso sss