-ic a-a a-b a-c a-i a-t aaa aab aac aad aai aar aas aat ab- aba abb abc abd abi abr abs abt ac- aca acb acc acd aci acr acs act ad- ada adb adc add adi adr ads adt ai- aia aib aic aid aii air ais ait ar- ara arb arc ard ari arr ars art as- asa asb asc asd asi asr ass ast at- ata atb atc atd ati atr ats att baa bab bac bad bai bar bas bat bba bbb bbc bbd bbi bbr bbs bbt bca bcb bcc bcd bci bcr bcs bct bda bdb bdc bdd bdi bdr bds bdt bi- bia bib bic bid bii bir bis bit bra brb brd bri brr brs brt bsa bsb bsc bsd bsi bsr bss bst bta btb btc btd bti btr bts btt c-- caa cab cac cad cai car cas cat cba cbb cbc cbd cbi cbr cbs cbt cca ccb ccc ccd cci ccr ccs cct cda cdb cdc cdd cdi cdr cds cdt ci- cia cib cic cid cii cir cis cit cra crb crc crd cri crr crs crt csa csb csc csd csi csr css cst cta ctb ctc ctd cti ctr cts ctt daa dab dac dad dai dar das dat dba dbb dbc dbd dbi dbr dbs dbt dca dcb dcc dcd dci dcr dcs dct dda ddb ddc ddd ddi ddr dds ddt di- dia dib dic did dii dir dis dit dra drb drc drd dri drr drs drt dsa dsb dsc dsd dsi dsr dss dst dta dtb dtc dtd dti dtr dts dtt i-d ia- iaa iab iac iad iai iar ias iat iba ibb ibc ibd ibi ibr ibs ibt ica icb icc icd ici icr ics ict ida idb idc idd idi idr ids idt iia iib iic iid iii iir iis iit ir- ira irb irc ird iri irr irs irt is- isa isb isc isd isi isr iss ist ita itb itc itd iti its itt ra- raa rab rac rad rai rar ras rat rba rbb rbc rbd rbi rbr rbs rbt rca rcb rcc rcd rci rcr rcs rct rda rdb rdc rdd rdi rdr rds rdt ria rib ric rid rii rir ris rit rra rrb rrc rrd rri rrr rrs rrt rsa rsb rsc rsd rsi rsr rss rst rta rtb rtc rtd rti rtr rts rtt saa sab sac sad sai sar sas sat sba sbb sbc sbd sbi sbr sbs sbt sca scb scc scd sci scr scs sct sda sdb sdc sdd sdi sdr sds sdt sia sib sic sid sii sir sis sit sr- sra srb src srd sri srr srs srt ss- ssa ssb ssc ssd ssi ssr sss sst sta stb stc std sti str sts stt taa tab tac tad tai tar tas tat tba tbb tbc tbd tbi tbr tbs tbt tca tcb tcc tcd tci tcr tcs tct tda tdb tdc tdd tdi tdr tds tdt tia tib tic tid tii tir tis tit tra trb trc trd tri trr trs trt tsa tsb tsc tsd tsi tsr tss tst tta ttb ttc ttd tti ttr tts ttt