return {
    {
        {
            {4,4,4,3,3,3,7,0,0,0},
            {4,1,6,6,2,3,7,0,0,0},
            {1,1,6,6,2,2,7,0,0,0},
            {1,7,7,7,7,2,7,0,0,0},
        },
        {
            {4,4,4,3,3,3,0,0,0,7},
            {4,1,6,6,2,3,0,0,0,7},
            {1,1,6,6,2,2,0,0,0,7},
            {1,7,7,7,7,2,0,0,0,7},
        },
        {
            {2,7,7,7,7,1,7,0,0,0},
            {2,2,6,6,1,1,7,0,0,0},
            {3,2,6,6,1,4,7,0,0,0},
            {3,3,3,4,4,4,7,0,0,0},
        },
        {
            {2,7,7,7,7,1,0,0,0,7},
            {2,2,6,6,1,1,0,0,0,7},
            {3,2,6,6,1,4,0,0,0,7},
            {3,3,3,4,4,4,0,0,0,7},
        },
    },-- 3*4 shape
    {
        {
            {1,1,0,0,0,0,0,3,3,3},
            {5,1,1,0,0,0,0,6,6,3},
            {5,5,2,2,0,0,0,6,6,4},
            {5,2,2,0,0,0,0,4,4,4},
        },
        {
            {1,1,0,0,0,0,0,4,4,4},
            {5,1,1,0,0,0,0,4,6,6},
            {5,5,2,2,0,0,0,3,6,6},
            {5,2,2,0,0,0,0,3,3,3},
        },
        {
            {3,3,3,1,1,0,0,0,0,0},
            {6,6,3,5,1,1,0,0,0,0},
            {6,6,4,5,5,2,2,0,0,0},
            {4,4,4,5,2,2,0,0,0,0},
        },
        {
            {4,4,4,1,1,0,0,0,0,0},
            {4,6,6,5,1,1,0,0,0,0},
            {3,6,6,5,5,2,2,0,0,0},
            {3,3,3,5,2,2,0,0,0,0},
        },
    },-- 7 piece opener(right>)(without i)
    {
        {
            {4,4,4,3,3,3,0,0,0,0},
            {4,1,6,6,2,3,0,0,0,0},
            {1,1,6,6,2,2,0,0,0,0},
            {1,7,7,7,7,2,0,0,0,0},
        },
        {
            {2,7,7,7,7,1,0,0,0,0},
            {2,2,6,6,1,1,0,0,0,0},
            {3,2,6,6,1,4,0,0,0,0},
            {3,3,3,4,4,4,0,0,0,0},
        },
    },-- 6 piece opener
    {
        {
            {0,0,0,0,0,1,3,5,6,7},
            {0,0,0,0,0,1,3,5,6,7},
            {0,0,0,0,0,1,3,5,6,7},
            {0,0,0,0,0,1,3,5,6,7},
        },
        {
            {1,0,0,0,0,0,3,5,6,7},
            {1,0,0,0,0,0,3,5,6,7},
            {1,0,0,0,0,0,3,5,6,7},
            {1,0,0,0,0,0,3,5,6,7},
        },
        {
            {1,3,0,0,0,0,0,5,6,7},
            {1,3,0,0,0,0,0,5,6,7},
            {1,3,0,0,0,0,0,5,6,7},
            {1,3,0,0,0,0,0,5,6,7},
        },
    },-- 4*5
    {
        {
            {0,0,0,0,0,0,1,3,5,7},
            {0,0,0,0,0,0,7,1,3,5},
            {0,0,0,0,0,0,5,7,1,3},
            {0,0,0,0,0,0,3,5,7,1},
        },
        {
            {7,0,0,0,0,0,0,5,3,1},
            {7,0,0,0,0,0,0,5,3,1},
            {7,0,0,0,0,0,0,5,3,1},
            {7,0,0,0,0,0,0,5,3,1},
        },
        {
            {1,3,0,0,0,0,0,0,6,5},
            {5,6,0,0,0,0,0,0,3,1},
            {5,7,0,0,0,0,0,0,3,1},
            {1,3,0,0,0,0,0,0,7,5},
        },
    },-- 4*6
}
