For each n, exhibit two regular expressions, R and S, of length poly(n), where L(R) L(S),
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For each n, exhibit two regular expressions, R and S, of length poly(n), where L(R) ≠ L(S), but where the first string on which they differ is exponentially long. In other words, L(R) and L(S) must be different, yet agree on all strings of length up to 2εn for some constant ε > 0.
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