-ic a-a a-c a-i aaa aac aaf aai aao aas ac- aca acc acf aci aco acs af- afa afc aff afi afo afs ai- aia aic aif aii aio ais aoa aoc aof aoi aoo aos as- asa asc asf asi aso ass c-- caa cac caf cai cao cas cca ccc ccf cci cco ccs cfa cfc cff cfi cfo cfs ci- cia cic cif cii cio cis co- coa coc cof coi coo cos csa csc csf csi cso css faa fac faf fai fao fas fca fcc fcf fci fco fcs ffa ffc fff ffi ffo ffs fia fic fif fii fis foa foc fof foi foo fos fsa fsc fsf fsi fso fss i-f ia- iaa iac iaf iai iao ias ica icc icf ici ico ics ifa ifc iff ifi ifo ifs iia iic iif iii iio iis io- ioa ioc iof ioi ioo ios is- isa isc isf isi iso iss o-i oaa oac oaf oai oao oas oc- oca occ ocf oci oco ocs of- ofa ofc off ofi ofo ofs oia oic oif oii oio ois oo- ooa ooc oof ooi ooo oos os- osa osc osf osi oso oss saa sac saf sai sao sas sca scc scf sci sco scs sfa sfc sff sfi sfo sfs sia sic sif sii sio sis soa soc sof soi soo sos ss- ssa ssc ssf ssi sso sss