Previous solution:
ais, ait, aits, ats, its, sat, sati, saw, sit, swat, taw, taws, waist, wait, waits, was, wast, wis, wist, wit, wits
ais, ait, aits, ats, its, sat, sati, saw, sit, swat, taw, taws, waist, wait, waits, was, wast, wis, wist, wit, wits