Question: L _ 1 = { a ^ i b ^ j c ^ k d ^ | i , j , k , in ,

L_1={a^i b^j c^k d^| i, j, k, in , j=k or i=}
Exercise 20 Design a pushdown automaton for L_1.Exercise 19 Design a context-free grammar for the following language
L_1={a^i b^j c^k d^| i, j, k, in , j=k or i=}
Informally describe your construction.

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