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        <description>1. Scrieti doua expresii regulate $ e_1$  si $ e_2$  peste alfabetul $ \Sigma=\{0,1\}$  astfel incat $ L(e_1) = \overline{L(e_2)}$  si $ L(e_1), L(e_2)$  sa fie ambele infinite.

2. Fie $ w = c_1c_2\ldots c_n$  un cuvant. Notam cu $ rep(w)$  cuvantul $ c_1c_1c_2c_2\ldots c_n$  si cu $ Rep(L)$ , limbajul $ \{rep(w) \in \Sigma^* \mid w \in L\}$ . Daca limbajul $ L$  este regulat atunci $ Rep(L)$  este regulat sau nu? Justificati.

3. Fie $ (q_1,1010,0010Z_0)$  o configuratie a unui APD. Ce tranzit…</description>
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