-ic a-a a-b a-c a-i aaa aab aac aae aai aak aap aas ab- aba abb abc abe abi abk abp abs ac- aca acb acc ace aci ack acp acs aea aeb aec aee aei aek aep aes ai- aia aib aic aie aii aik aip ais aka akb akc ake aki akk akp aks ap- apa apb apc ape api apk app aps as- asa asb asc ase asi ask asp ass b-p baa bab bac bae bai bak bap bas bba bbb bbc bbe bbi bbk bbp bbs bca bcb bcc bce bci bck bcp bcs be- bea beb bec bee bei bek bep bes bi- bia bib bic bie bii bik bip bis bka bkb bkc bke bkk bkp bks bpa bpb bpc bpe bpi bpp bps bsa bsb bsc bse bsi bsk bsp bss c-- caa cab cac cae cai cak cap cas cba cbb cbc cbe cbi cbk cbp cbs cca ccb ccc cce cci cck ccp ccs ce- cea ceb cec cee cei cek cep ces ci- cia cib cic cie cii cik cip cis cka ckb ckc cki cks cpa cpb cpc cpe cpi cpk cpp cps csa csb csc cse csi csk csp css eaa eab eac eae eai eak eap eas eba ebb ebc ebe ebi ebk ebp ebs ec- eca ecb ecc ece eci eck ecs eea eeb eec eee eek eep ees eia eib eic eie eii eik eip eis eka ekb ekc eke eki ekp eks ep- epa epb epc epe epi epp eps es- esa esb esc ese esi esk esp ess ia- iaa iab iac iae iai iap ias iba ibb ibc ibe ibi ibk ibp ibs ica icb icc ice ici ick icp ics ie- iea iec iee iei iek iep ies iia iib iic iie iii iip iis ika ikb ikc ike iki ikk iks ipa ipb ipc ipe ipi ipp ips is- isa isb isc ise isi isk isp iss ka- kaa kab kac kae kai kak kap kas kba kbb kbc kbe kbi kbk kbp kbs kca kcb kcc kce kci kck kcp kcs ke- kea keb kec kee kei kek kep kes kia kib kic kie kii kik kip kis kkb kkc kke kki kkk kkp kks kpa kpc kpe kpi kpk kpp kps ksa ksb ksc kse ksi ksk ksp kss p-p paa pab pac pae pai pak pap pas pba pbb pbc pbe pbi pbk pbp pbs pca pcb pcc pce pci pck pcp pcs pea peb pec pee pei pek pep pes pia pib pic pie pii pik pip pis pka pkb pkc pke pki pkp pks ppa ppb ppc ppe ppi ppk ppp pps ps- psa psb psc pse psi psk psp pss saa sab sac sae sai sak sap sas sba sbb sbc sbe sbi sbk sbp sbs sca scb scc sce sci sck scp scs se- sea seb sec see sei sek sep ses sia sib sic sie sii sik sip sis sk- ska skb skc ske ski skk skp sks spa spb spc spe spi spk spp sps ss- ssa ssb ssc sse ssi ssk ssp sss