-ic a-a a-b a-c a-i aaa aab aac aai aak aap aas aax ab- aba abb abc abi abk abp abs abx ac- aca acb acc aci ack acp acs acx ai- aia aib aic aii aik aip ais aix aka akb akc aki akk akp aks ap- apa apb apc api apk app aps apx as- asa asb asc asi ask asp ass asx ax- axa axi axk axp axs axx b-p baa bab bac bai bak bap bas bax bba bbb bbc bbi bbk bbp bbs bbx bca bcb bcc bci bck bcp bcs bcx bi- bia bib bic bii bik bip bis bix bka bkb bkc bkk bkp bks bkx bpa bpb bpc bpi bpp bps bpx bsa bsb bsc bsi bsk bsp bss bsx bxb bxi bxx c-- caa cab cac cai cak cap cas cax cba cbb cbc cbi cbk cbp cbs cbx cca ccb ccc cci cck ccp ccs ccx ci- cia cib cic cii cik cip cis cix cka ckb ckc cki cks ckx cpa cpb cpc cpi cpk cpp cps cpx csa csb csc csi csk csp css csx cxc cxi cxk cxp cxs cxx ia- iaa iab iac iai iap ias iba ibb ibc ibi ibk ibp ibs ibx ica icb icc ici ick icp ics iia iib iic iii iip iis iix ika ikb ikc iki ikk iks ikx ipa ipb ipc ipi ipp ips ipx is- isa isb isc isi isk isp iss ixc ixi ka- kaa kab kac kai kak kap kas kax kba kbb kbc kbi kbk kbp kbs kbx kca kcb kcc kci kck kcp kcs kcx kia kib kic kii kik kip kis kix kkb kkc kki kkk kkp kks kpa kpc kpi kpk kpp kps ksa ksb ksc ksi ksk ksp kss p-p paa pab pac pai pak pap pas pax pba pbb pbc pbi pbk pbp pbs pbx pca pcb pcc pci pck pcp pcs pcx pia pib pic pii pik pip pis pix pka pkb pkc pki pkp pks ppa ppb ppc ppi ppk ppp pps ppx ps- psa psb psc psi psk psp pss psx pxc pxk pxs saa sab sac sai sak sap sas sax sba sbb sbc sbi sbk sbp sbs sbx sca scb scc sci sck scp scs scx sia sib sic sii sik sip sis six sk- ska skb skc ski skk skp sks skx spa spb spc spi spk spp sps spx ss- ssa ssb ssc ssi ssk ssp sss ssx sxc sxi sxs xaa xac xak xap xas xbc xbx xcb xci xcp xcx xia xic xii xis xix xkb xks xpa xpb xpc xpp xps xsa xsb xsc xsi xsp xss xxi xxp xxx