a-a a-b aaa aab aad aao aar aau aax ab- aba abb abd abo abr abu abx ad- ada adb add ado adr adu adx aoa aob aod aoo aor aou aox ar- ara arb ard aro arr aru arx au- aua aub aud auo aur aux ax- axa axo axr axx b-u baa bab bad bao bar bau bax bba bbb bbd bbo bbr bbu bbx bda bdb bdd bdo bdr bdu bdx boa bob bod boo bor bou box bra brb brd bro brr bru brx bua bub bud buo bur buu bux bxb bxd bxo bxx daa dab dad dao dar dau dax dba dbb dbd dbo dbr dbu dbx dda ddb ddd ddo ddr ddu ddx doa dob dod doo dor dou dox dra drb drd dro drr dru drx dua dub dud duo dur dux dxd dxo dxr dxx oaa oab oad oao oar oau oax ob- oba obb obd obo obr obu obx oda odb odd odo odr odu oo- ooa oob ood ooo oor oox or- ora orb ord oro orr oru orx ou- oua oud ouo our ox- oxa oxb oxo oxx ra- raa rab rad rao rar rau rax rba rbb rbd rbo rbr rbu rbx rda rdb rdd rdo rdr rdu rdx roa rob rod roo ror rou rox rra rrb rrd rrr rru rua rub rud ruo rur ruu rux rxr ua- uaa uab uad uao uar uau uba ubb ubo ubr ubu ubx uda udb udd udo udr udu udx uoa uob uod uoo uor uox ur- ura urb urd uro urr uru urx uua uur uuu uxb uxo uxr uxu xaa xad xar xau xbr xbx xda xdb xdr xoa xod xoo xor xox xrd xrx xxo xxx