a-a a-b a-i aaa aab aad aai aak aar ab- aba abb abd abi abk abr ad- ada adb add adi adk adr ai- aia aib aid aii aik air aka akb akd aki akk akr ar- ara arb ard ari ark arr baa bab bad bai bak bar bba bbb bbd bbi bbk bbr bda bdb bdd bdi bdk bdr bi- bia bib bid bii bik bir bka bkb bkk bkr bra brb brd bri brk brr daa dab dad dai dak dar dba dbb dbd dbi dbk dbr dda ddb ddd ddi ddk ddr di- dia dib did dii dik dir dka dkb dki dkk dkr dra drb drd dri drk drr i-d ia- iaa iab iad iai iar iba ibb ibd ibi ibk ibr ida idb idd idi idk idr iia iib iid iii iir ika ikb iki ikk ikr ir- ira irb ird iri irk irr ka- kaa kab kad kai kak kar kba kbb kbd kbi kbk kbr kda kdb kdk kdr kia kib kid kii kik kir kkb kki kkk kkr kra krd kri krk krr ra- raa rab rad rai rak rar rba rbb rbd rbi rbk rbr rda rdb rdd rdi rdr ria rib rid rii rik rir rkb rkk rra rrb rrd rri rrk rrr