The series provided is:
Let's break down each group of letters into their individual characters and observe the pattern:
First letters: w, v, u, t These letters are decreasing by one in the alphabet: w → v → u → t.
Second letters: x, x, x, x The second letter remains constant as "x".
Third letters: g, h, i, j These letters are increasing by one in the alphabet: g → h → i → j.
Fourth letters: z, y, x, w These letters are decreasing by one in the alphabet: z → y → x → w.
Following the identified patterns:
Thus, the next group of letters should be sxkv.
\(\boxed{sxkv}\)
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