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Regular constraint
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<p>In <a href="/facts/Artificial_intelligence/lJGauQwX">artificial intelligence</a> and <a href="/facts/Operations_research/H5yJkV5n">operations research</a>, a regular constraint is a kind of global constraint. It can be used to solve a particular type of puzzle called a <a href="/facts/Nonogram/t7h59YcR">nonogram</a> or logigrams. </p>