-ic a-a a-c a-i aaa aac aaf aai aap aas aax ac- aca acc acf aci acp acs acx af- afa afc aff afi afp afs afx ai- aia aic aif aii aip ais aix ap- apa apc apf api app aps apx as- asa asc asf asi asp ass asx ax- axa axi axp axs axx c-- caa cac caf cai cap cas cax cca ccc ccf cci ccp ccs ccx cfa cfc cff cfi cfp cfs cfx ci- cia cic cif cii cip cis cix cpa cpc cpf cpi cpp cps cpx csa csc csf csi csp css csx cxc cxf cxi cxp cxs cxx faa fac faf fai fap fas fax fca fcc fcf fci fcp fcs fcx ffa ffc fff ffi ffp ffs ffx fia fic fif fii fip fis fix fpa fpc fpi fpp fps fpx fsa fsc fsf fsi fsp fss fsx fxi fxp fxs fxx i-f ia- iaa iac iaf iai iap ias ica icc icf ici icp ics ifa ifc iff ifi ifp ifs ifx iia iic iif iii iip iis iix ipa ipc ipf ipi ipp ips ipx is- isa isc isf isi isp iss ixc ixi p-p paa pac paf pai pap pas pax pca pcc pcf pci pcp pcs pcx pfa pfc pff pfi pfp pfs pfx pia pic pif pii pip pis pix ppa ppc ppf ppi ppp pps ppx ps- psa psc psf psi psp pss psx pxc pxs saa sac saf sai sap sas sax sca scc scf sci scp scs scx sfa sfc sff sfi sfp sfs sfx sia sic sif sii sip sis six spa spc spf spi spp sps spx ss- ssa ssc ssf ssi ssp sss ssx sxc sxi sxs xaa xac xaf xap xas xcf xci xcp xcx xfa xfs xfx xia xic xii xis xix xpa xpc xpf xpp xps xsa xsc xsi xsp xss xxi xxp xxx