a-a a-b a-i aaa aab aad aai aar aau ab- aba abb abd abi abr abu ad- ada adb add adi adr adu ai- aia aib aid aii air aiu ar- ara arb ard ari arr aru au- aua aub aud aui aur b-u baa bab bad bai bar bau bba bbb bbd bbi bbr bbu bda bdb bdd bdi bdr bdu bi- bia bib bid bii bir biu bra brb brd bri brr bru bua bub bud bui bur buu daa dab dad dai dar dau dba dbb dbd dbi dbr dbu dda ddb ddd ddi ddr ddu di- dia dib did dii dir diu dra drb drd dri drr dru dua dub dud dui dur i-d ia- iaa iab iad iai iar iau iba ibb ibd ibi ibr ibu ida idb idd idi idr idu iia iib iid iii iir iiu ir- ira irb ird iri irr iru iu- iua iub iud iui iur ra- raa rab rad rai rar rau rba rbb rbd rbi rbr rbu rda rdb rdd rdi rdr rdu ria rib rid rii rir rra rrb rrd rri rrr rru rua rub rud rui rur ruu ua- uaa uab uad uai uar uau uba ubb ubi ubr ubu uda udb udd udi udr udu uia uib uid uii uir uiu ur- ura urb urd uri urr uru uua uur uuu