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4 letter words:

phon9, pion6,

3 letter words:

pix12, pox12, nix10, hip8, hop8, phi8, poh8, hin6, hon6, noh6, nip5, pin5, poi5, ion3,

2 letter words:

ox9, xi9, hi5, ho5, oh5, op4, pi4, in2, no2, oi2, on2,