The figure obtained by removing one small unit square from the 2×2 grid table is called an L ''shape". .Put k L-shapes in an 8×8 grid table. Each L-shape can be rotated, but each L shape is required to cover exactly three small unit squares in the grid table, and the common area covered by any two L shapes is 0, and except for these k L shapes, no other L shapes can be placed. Find the minimum value of k. combinatoricscombinatorial geometrytilesTiling