-ic c-- ccc ccf cci cck ccs cfc cff cfi cfk cfs ci- cic cif cii cik cis ckc cki cks csc csf csi csk css fcc fcf fci fck fcs ffc fff ffi ffk ffs fic fif fii fik fis fkc fkf fki fkk fsc fsf fsi fsk fss i-f icc icf ici ick ics ifc iff ifi ifs iic iif iii iis ikc ikf iki ikk iks is- isc isf isi isk iss kcc kci kck kcs kfc kff kfi kfs kic kif kii kik kis kkc kki kkk kks ksc ksf ksi ksk kss scc scf sci sck scs sfc sff sfi sfk sfs sic sif sii sik sis sk- skc skf ski skk sks ss- ssc ssf ssi ssk sss