-ic a-a a-b a-c a-i a-t aaa aab aac aad aai aar aat ab- aba abb abc abd abi abr abt ac- aca acb acc acd aci acr act ad- ada adb adc add adi adr adt ai- aia aib aic aid aii air ait ar- ara arb arc ard ari arr art at- ata atb atc atd ati atr att baa bab bac bad bai bar bat bba bbb bbc bbd bbi bbr bbt bca bcb bcc bcd bci bcr bct bda bdb bdc bdd bdi bdr bdt bi- bia bib bic bid bii bir bit bra brb brd bri brr brt bta btb btc btd bti btr btt c-- caa cab cac cad cai car cat cba cbb cbc cbd cbi cbr cbt cca ccb ccc ccd cci ccr cct cda cdb cdc cdd cdi cdr cdt ci- cia cib cic cid cii cir cit cra crb crc crd cri crr crt cta ctb ctc ctd cti ctr ctt daa dab dac dad dai dar dat dba dbb dbc dbd dbi dbr dbt dca dcb dcc dcd dci dcr dct dda ddb ddc ddd ddi ddr ddt di- dia dib dic did dii dir dit dra drb drc drd dri drr drt dta dtb dtc dtd dti dtr dtt i-d ia- iaa iab iac iad iai iar iat iba ibb ibc ibd ibi ibr ibt ica icb icc icd ici icr ict ida idb idc idd idi idr idt iia iib iic iid iii iir iit ir- ira irb irc ird iri irr irt ita itb itc itd iti itt ra- raa rab rac rad rai rar rat rba rbb rbc rbd rbi rbr rbt rca rcb rcc rcd rci rcr rct rda rdb rdc rdd rdi rdr rdt ria rib ric rid rii rir rit rra rrb rrc rrd rri rrr rrt rta rtb rtc rtd rti rtr rtt taa tab tac tad tai tar tat tba tbb tbc tbd tbi tbr tbt tca tcb tcc tcd tci tcr tct tda tdb tdc tdd tdi tdr tdt tia tib tic tid tii tir tit tra trb trc trd tri trr trt tta ttb ttc ttd tti ttr ttt