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import CW8a._
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assert(der('a', ZERO | ONE) == (ZERO | ZERO))
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assert(der('a', (CHAR('a') | ONE) ~ CHAR('a')) == ALT((ONE | ZERO) ~ CHAR('a'), ONE))
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assert(der('a', (CHAR('a') | CHAR('a')) ~ CHAR('a')) == (ONE | ONE) ~ CHAR('a'))
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assert(der('a', STAR(CHAR('a'))) == (ONE ~ STAR(CHAR('a'))))
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assert(der('b', STAR(CHAR('a'))) == (ZERO ~ STAR(CHAR('a'))))
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