Question: Let Sigma = { 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 }

Let \Sigma ={0,1,2,3,4,5,6,7,8,9}, and N, the set of nonterminals, be {D, E}, with E being the start symbol, and the productions are D -> digit, which is shorthand for the 10 productions D ->0, D ->1, and so on E -> D, E -> ED. Which of the following strings could occur in a derivation?
EEE
\lambda
EDD
+45

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