BL1-1BL1-2BL1-3BL1-4BL2-1BL2-2BL2-3BL2-4BL3-1BL3-2BL3-3BL3-4BL4-1BL4-2BL4-3BL4-4BL5-1BL5-2BL5-3BL5-4BL6-1BL6-2BL6-3BL6-4