-ic a-a a-b a-c a-i a-t aaa aab aac aai aap aar aas aat ab- aba abb abc abi abp abr abs abt ac- aca acb acc aci acp acr acs act ai- aia aib aic aii aip air ais ait ap- apa apb apc api app apr aps apt ar- ara arb arc ari arp arr ars art as- asa asb asc asi asp asr ass ast at- ata atb atc ati atp atr ats att b-p baa bab bac bai bap bar bas bat bba bbb bbc bbi bbp bbr bbs bbt bca bcb bcc bci bcp bcr bcs bct bi- bia bib bic bii bip bir bis bit bpa bpb bpc bpi bpp bpr bps bpt bra brb bri brp brr brs brt bsa bsb bsc bsi bsp bsr bss bst bta btb btc bti btp btr bts btt c-- caa cab cac cai cap car cas cat cba cbb cbc cbi cbp cbr cbs cbt cca ccb ccc cci ccp ccr ccs cct ci- cia cib cic cii cip cir cis cit cpa cpb cpc cpi cpp cpr cps cpt cra crb crc cri crp crr crs crt csa csb csc csi csp csr css cst cta ctb ctc cti ctp ctr cts ctt ia- iaa iab iac iai iap iar ias iat iba ibb ibc ibi ibp ibr ibs ibt ica icb icc ici icp icr ics ict iia iib iic iii iip iir iis iit ipa ipb ipc ipi ipp ipr ips ipt ir- ira irb irc iri irp irr irs irt is- isa isb isc isi isp isr iss ist ita itb itc iti itp its itt p-p paa pab pac pai pap par pas pat pba pbb pbc pbi pbp pbr pbs pbt pca pcb pcc pci pcp pcr pcs pct pia pib pic pii pip pir pis pit ppa ppb ppc ppi ppp ppr pps ppt pra prb prc pri prp prr prs prt ps- psa psb psc psi psp psr pss pst pt- pta ptb ptc pti ptp ptr pts ptt ra- raa rab rac rai rap rar ras rat rba rbb rbc rbi rbp rbr rbs rbt rca rcb rcc rci rcp rcr rcs rct ria rib ric rii rip rir ris rit rpa rpb rpc rpi rpp rpr rps rpt rra rrb rrc rri rrp rrr rrs rrt rsa rsb rsc rsi rsp rsr rss rst rta rtb rtc rti rtp rtr rts rtt saa sab sac sai sap sar sas sat sba sbb sbc sbi sbp sbr sbs sbt sca scb scc sci scp scr scs sct sia sib sic sii sip sir sis sit spa spb spc spi spp spr sps spt sr- sra srb src sri srp srr srs srt ss- ssa ssb ssc ssi ssp ssr sss sst sta stb stc sti stp str sts stt taa tab tac tai tap tar tas tat tba tbb tbc tbi tbp tbr tbs tbt tca tcb tcc tci tcp tcr tcs tct tia tib tic tii tip tir tis tit tpa tpb tpc tpi tpp tpr tps tpt tra trb trc tri trp trr trs trt tsa tsb tsc tsi tsp tsr tss tst tta ttb ttc tti ttp ttr tts ttt