The condition min i = min k implies that we are not moving this leftmost index from row to column.
the addresses of the three copy symbols required are all formed by adding or removing x orx to the row and column addresses (i, j); because the leftmost index of i is not modified, the copy symbols that are required are all above the diagonal, and are present in the seed matrix t. A appears in cell (k, ) of t (n+3) .