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Give context - free grammars that produce the following languages over the alphabet Sigma = { a , b , c } : (

Give context-free grammars that produce the following languages over the alphabet \Sigma ={a, b, c}: (a) L1 :={anbm |m<=n<=2m}.
(b) L2 :={ucv | u,v in {a,b},|u|=|v|}.(c) L3 :={aibjck |i=j ori=k}
(d) L4 :=

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