-ic a-a a-b a-c a-i aaa aab aac aae aai aap aas ab- aba abb abc abe abi abp abs ac- aca acb acc ace aci acp acs aea aeb aec aee aei aep aes ai- aia aib aic aie aii aip ais ap- apa apb apc ape api app aps as- asa asb asc ase asi asp ass b-p baa bab bac bae bai bap bas bba bbb bbc bbe bbi bbp bbs bca bcb bcc bce bci bcp bcs be- bea beb bec bee bei bep bes bi- bia bib bic bie bii bip bis bpa bpb bpc bpe bpi bpp bps bsa bsb bsc bse bsi bsp bss c-- caa cab cac cae cai cap cas cba cbb cbc cbe cbi cbp cbs cca ccb ccc cce cci ccp ccs ce- cea ceb cec cee cei cep ces ci- cia cib cic cie cii cip cis cpa cpb cpc cpe cpi cpp cps csa csb csc cse csi csp css eaa eab eac eae eai eap eas eba ebb ebc ebe ebi ebp ebs ec- eca ecb ecc ece eci ecs eea eeb eec eee eep ees eia eib eic eie eii eip eis ep- epa epb epc epe epi epp eps es- esa esb esc ese esi esp ess ia- iaa iab iac iae iai iap ias iba ibb ibc ibe ibi ibp ibs ica icb icc ice ici icp ics ie- iea iec iee iei iep ies iia iib iic iie iii iip iis ipa ipb ipc ipe ipi ipp ips is- isa isb isc ise isi isp iss p-p paa pab pac pae pai pap pas pba pbb pbc pbe pbi pbp pbs pca pcb pcc pce pci pcp pcs pea peb pec pee pei pep pes pia pib pic pie pii pip pis ppa ppb ppc ppe ppi ppp pps ps- psa psb psc pse psi psp pss saa sab sac sae sai sap sas sba sbb sbc sbe sbi sbp sbs sca scb scc sce sci scp scs se- sea seb sec see sei sep ses sia sib sic sie sii sip sis spa spb spc spe spi spp sps ss- ssa ssb ssc sse ssi ssp sss