a-a a-b aaa aab aaj aao aar aas aau ab- aba abb abj abo abr abs abu aja ajb ajj ajo ajr ajs aju aoa aob aoj aoo aor aos aou ar- ara arb arj aro arr ars aru as- asa asb asj aso asr ass asu au- aua aub auj auo aur aus b-u baa bab baj bao bar bas bau bba bbb bbo bbr bbs bbu bja bjj bjr bjs bju boa bob boj boo bor bos bou bra brb brj bro brr brs bru bsa bsb bsj bso bsr bss bsu bua bub buj buo bur bus buu jaa jab jaj jao jar jas jau jba jbj jbo jbr jbs jbu jja jjb jjj jjr jjs jju joa job joj joo jor jos jou jra jrb jro jrr jrs jsa jsb jsj jso jsr jss jsu jub juo jur jus oaa oab oaj oao oar oas oau ob- oba obb obj obo obr obs obu oja ojb ojo ojs oju oo- ooa oob ooo oor oos or- ora orb oro orr ors oru os- osa osb osj oso osr oss osu ou- oua ouo our ous ra- raa rab raj rao rar ras rau rba rbb rbo rbr rbs rbu rja rjr roa rob roj roo ror ros rou rra rrb rrr rrs rru rsa rsb rsj rso rsr rss rsu rua rub ruo rur rus ruu saa sab saj sao sar sas sau sba sbb sbj sbo sbr sbs sbu sja sjb sjj sjr sjs sju soa sob soj soo sor sos sou sr- sra srb srj sro srr srs ss- ssa ssb ssj sso ssr sss ssu sua sub suo sur sus suu ua- uaa uab uaj uao uar uas uau uba ubb ubo ubr ubs ubu ujo ujs uoa uob uoj uoo uor uos ur- ura urb uro urr urs uru usa usb usj uso usr uss usu uua uur uus uuu