Produce a context-free grammar (CFG) for each of the following lan- guages, assuming Σ = {0,1}: (a) {w |w starts and ends with different symbols} (b) {w |the length of w is an integer multiple of 3} (c) {wwR| i.e., a word followed by that word reversed} Note: For 1b and 1c, the start symbol, S, should go to the empty string as an option.

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