a-a a-b a-t aaa aab aad aak aar aat ab- aba abb abd abk abr abt ad- ada adb add adk adr adt aka akb akd akk akr ar- ara arb ard ark arr art at- ata atb atd atr att baa bab bad bak bar bat bba bbb bbd bbk bbr bbt bda bdb bdd bdk bdr bdt bka bkb bkk bkr bkt bra brb brd brk brr brt bta btb btd btk btr btt daa dab dad dak dar dat dba dbb dbd dbk dbr dbt dda ddb ddd ddk ddr ddt dka dkb dkk dkr dkt dra drb drd drk drr drt dta dtb dtd dtk dtr dtt k-t ka- kaa kab kad kak kar kat kba kbb kbd kbk kbr kda kdb kdk kdr kdt kkb kkk kkr kkt kra krd krk krr krt kta ktb ktk ktr ktt ra- raa rab rad rak rar rat rba rbb rbd rbk rbr rbt rda rdb rdd rdr rdt rkb rkk rkt rra rrb rrd rrk rrr rrt rta rtb rtd rtk rtr rtt taa tab tad tak tar tat tba tbb tbd tbk tbr tbt tda tdb tdd tdk tdr tdt tka tkb tkk tkr tkt tra trb trd trk trr trt tta ttb ttd ttk ttr ttt