-ic a-a a-b a-c a-i a-t aaa aab aac aai aap aas aat ab- aba abb abc abi abp abs abt ac- aca acb acc aci acp acs act ai- aia aib aic aii aip ais ait ap- apa apb apc api app aps apt as- asa asb asc asi asp ass ast at- ata atb atc ati atp ats att b-p baa bab bac bai bap bas bat bba bbb bbc bbi bbp bbs bbt bca bcb bcc bci bcp bcs bct bi- bia bib bic bii bip bis bit bpa bpb bpc bpi bpp bps bpt bsa bsb bsc bsi bsp bss bst bta btb btc bti btp bts btt c-- caa cab cac cai cap cas cat cba cbb cbc cbi cbp cbs cbt cca ccb ccc cci ccp ccs cct ci- cia cib cic cii cip cis cit cpa cpb cpc cpi cpp cps cpt csa csb csc csi csp css cst cta ctb ctc cti ctp cts ctt ia- iaa iab iac iai iap ias iat iba ibb ibc ibi ibp ibs ibt ica icb icc ici icp ics ict iia iib iic iii iip iis iit ipa ipb ipc ipi ipp ips ipt is- isa isb isc isi isp iss ist ita itb itc iti itp its itt p-p paa pab pac pai pap pas pat pba pbb pbc pbi pbp pbs pbt pca pcb pcc pci pcp pcs pct pia pib pic pii pip pis pit ppa ppb ppc ppi ppp pps ppt ps- psa psb psc psi psp pss pst pt- pta ptb ptc pti ptp pts ptt saa sab sac sai sap sas sat sba sbb sbc sbi sbp sbs sbt sca scb scc sci scp scs sct sia sib sic sii sip sis sit spa spb spc spi spp sps spt ss- ssa ssb ssc ssi ssp sss sst sta stb stc sti stp sts stt taa tab tac tai tap tas tat tba tbb tbc tbi tbp tbs tbt tca tcb tcc tci tcp tcs tct tia tib tic tii tip tis tit tpa tpb tpc tpi tpp tps tpt tsa tsb tsc tsi tsp tss tst tta ttb ttc tti ttp tts ttt