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4 letter words:

ains4, anis4, inia4, ions4, naoi4, naos4, nisi4, sain4,

3 letter words:

ain3, ais3, ani3, ins3, ion3, nos3, ons3, sin3, son3,

2 letter words:

ai2, an2, as2, in2, is2, na2, no2, oi2, on2, os2, si2, so2,