Question: is the languages regular? Prove ( by providing a regular expression or NFA ) or disprove. L 1 = { a ^ i b ^

is the languages regular? Prove (by providing a regular expression or NFA) or disprove. L1={a^i b^j c^k d^l |(i + j) mod 2=(k + l) mod 2, i, j, k, l >0}

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