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We use erasers-like basic operations on words to construct a set that is bothBorel and above Delta^0_omega, built as a set V^\omega where V is a language offinite words accepted by a pushdown automaton. In particular, this gives afirst example of an omega-power of a context free language which is a Borel setof infinite rank.

An omega-power of a context-free language which is Borel above Delta^0_omega