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- Let ANTIPALINDROME be the language of all even-length strings over the alphabet {a,b} such that, for all i, the i-th letter from the start is different to the i-th letter from the end. Examples of strings in this language include: ε, ab, ba, aabb, abab, baba, bbaa, aaabbb, ... Give a Context-Free Grammar for the language ANTIPALINDROME.Given the following Regular Grammar (RG) StS zF F→ 2G|z G→tG|t Which of the following strings can be generated by it? i. tzz ii. ztt iii. ttzz iv. zztt O A. i, ii, and iii B. ii, iii, and iv O C. ii and iv O D. i and iiiConsider a grammar for expressions is defined as follows:<assign> → <id> = <expr><id> → A | B | C | D<expr> → <id> + <expr>| <id> * <expr>| ( <expr> )| <id>Give a recursive descent algorithm for the BNF defined above.You may abstract away some details and are expected to make your answer using pseudo code.
- The following grammar is an indirect left recursive grammar S→ Bb a B→ Salb Strings of the language generated by this grammar are of the following form: L= {a(w)m, bb(w)" | w = , m, n EN } This indirect left recursive grammar can be transformed to a right recursive grammar as follows: S T → This right recursive grammar is an LL( ) grammar.The following given grammar is a left recursive grammar S Sbab balb The language generated by this grammar is of the following form: L= { ba(bab), b(bab)" | m,ne N} This left recursive grammar can be transformed to a right recursive grammar as follows: S → T -> This right recursive grammar is an LL( ) grammar.Using Java, a program that reads as input an arbitrary context-free grammar from a text file and then derives/enumerates five strings from the grammar. The file cfg.txt can be used to test your program. The grammar represented in cfg.txt is the following grammar for non-palindromes (from input alphabet {a,b}): S -> aSa | bSb | XX -> aYb | bYaY -> aY | bY | lambdaThis is formatted in cfg.txt as follows: S aSaS bSbS XX aYbX bYaY aYY bYY *An asterisk is used for lambda. Assume that the first state listed in the input file is the start state. Read the grammar into a map (aka hash or dictionary) where the key is a variable and the value is a list of right-hand sides. If you are using Java, you could use Hashtable by declaring a Hashtable of the following type:Hashtable<String, ArrayList<String>>Do not write the program specific to this grammar in cfg.txt. Further, assume that the test file will have more than three variables, and productions on the right hand side can…
- The language generated by the following grammar is S→ SaaS | C This grammar is left recursive, hence, it is not LL(k) for any k. Fill out the blank below to make the resulting grammar equivalent to the above grammar but with no left recursion. Is the resulting grammar LL(k)? Yes If your answer is YES, then what is the value of k? k = NoPredictive parsers are recursive descent parsers that need no backtracking and can be constructed for a class of grammars called LL (1). The first "L" in LL (1) indicates that, scanning the input from left to right. The second "L" in LL (1) signifies that, producing a leftmost derivation. The "1" in LL (1) indicates that, using one input symbol of lookahead at each step to make parsing action decisions. Like recursive descent, the LL (1) technique is top-down, goal oriented, and predictive. Consider the grammar G5: S → iEtSS′|a S′ → eS|ԑ E → bConstruct the LL (1) parsing table for the grammar G5 and use the LL (1)parsing table for the grammar G5 to check whether the grammar G5 is LL (1). Algorithm sheet: Algorithm for Constructing LL (1) Parsing Table Input: Grammar G.Output: Parsing table M.Method: For each production A → a of the grammar, do the following: Step 1: For each terminal "a" in ????? (a), add A → a to M[A, a].Step 2: If ? is in ????? (a), then for each terminal b in…. What are the actions in shift reduce parsing. Consider the following grammar S→E E→E+T E→T T→ id And the string "id +id+id". Perform shift reduce parsing using the given string
- Given the following EBNF grammar: A -> [B, C,] D B-> '(, E, F, '), E C-> ', G D->-, G E -> " " F-> "o", "D", G-> "I" Give an example sentence that is within the grammar. NB: you can ignore whitespace.Computer Science How do I solve the parsing problem that checks whether a given string belongs to the language given by any Context Free Grammar G1?How can I generate the parse tree for any input string on given Context Free Grammar G1 by the user. example cfg.txt : (# is used for ε) E>E+T|T T>F|T*F F>(E)|a implement your solution in C# or java. Dont post a c++ cyk algrithm its incorrect for this work.Give a Chomsky normal form grammar for the set A = {w∈{a,b}^+ | #a(w) = #b(w)}. Recall the symbol + means "1 or more copies" as opposed to the * symbol that means "0 or more copies". Here, set A is non-null strings with an equal number of a's and b's.