“…We will denote such an array by OA . Recently, many new methods of constructing OAs, especially high strength OAs, have been presented, and many new classes of OAs have been obtained [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ]. An OA is said to be an irredundant orthogonal array (IrOA) if, in any subarray, all of its rows are different [ 18 ].…”