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5 letter words:

kiosk13, kooks13,

4 letter words:

kook12, woks11, kois8, sook8, woos7,

3 letter words:

wok10, kis7, koi7, kos7, ski7, sow6, wis6, woo6, wos6,

2 letter words:

ki6, ow5, wo5, is2, oi2, os2, si2, so2,