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Here question 4, a context free grammar for the language l can be defined as follows.
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Variables here s, a, b, c, d.
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Terminals here a, b.
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Productions as follows s, a, a, a, a, a, a, b, b, b, c, c, b, d, then d, b, d.
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Now question 5, the language l can be recognized by the following context free grammar.
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Variables s, a, b, c...