GATE 2026 · CS2 - Afternoon
Let Σ = {a,b,c,d} and let L = {\(a^{i}\) \(b^{j}\) \(c^{k}\) \(d^{l}\) | i,j,k,l ≥ 0}.
Which of the following constraints ensure(s) that the language L is context-free?
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