SUBSTANDARD

aa ab ad an ar as at ba na nu ta un us ut

aas aba abs add ads ana and ant arb ars art ass baa bad ban bar bas bat bra bud bun bur bus but dab dad dan dub dud dun nab nub nus nut rad ran ras rat rub run rut sab sad sat sau sub sun tab tad tan tar tas tau tub tun uns urb urd urn uta uts

abas abut adds anas ands ansa anta ants anus arbs arts aunt aura baas bads band bans bard barn bars bass bast bats baud brad bran bras brat brut buds buna bund buns bunt bura burd burn burs buss bust buts dabs dada dads dans darb darn dart data daub daut drab drat drub duad dubs duds duns dunt dura durn dust nabs nada nard nubs nurd nuts rads rand rant rats rubs rudd runs runt rust ruts sabs sand sans sard snub stab star stub stud stun suba subs sudd suds suns sura surd tabs tabu tads tans tarn tars tass taus trad tsar tuba tubs tuna tuns turd turn urbs urds urns ursa utas