A fluorinated polymer comprising recurring units of formulae (1a) to (1d) and having a Mw of 1,000-500,000 is provided. R.sup.1 is an acid labile group, R.sup.2 is a single bond or methylene, a1, a2, a3, and a4 are numbers from more than 0 to less than 1, and 0

 
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