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4 letter words:

updo7, dido6,

3 letter words:

zip14, dip6, dup6, pod6, pud6, did5, dud5, odd5, piu5, poi5, upo5, dui4, duo4, oud4, udo4,

2 letter words:

op4, pi4, up4, do3, id3, od3, oi2,