2x3-square-square-square-square-square-square-square-square-square-square-square-square-square-square-square-square-square-square-square-se-se-square-se-se-se-se-se-se-s d ' une superficie de 2x-square-square-square-square-square-square-square-square-square-square-square-square-square-square-square-square-square-square-se-s