design the algorithm which computs the placements of 21 triomino that cover 8*8 chess board

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A triomino is formed by joining three unit-sized squares in m L-shape.
Amutiled chessboard(henceforth 8 x 8M board) is made up of 64 unitsized
squares arranged in an 8 × 8 square minus the topleft square. design the algorithm which computs the placements of 21 triomino that cover 8*8 chess board.