Verify that both of blocks "Outer-1" and "Outer-2" has borderlines on all four sides. Verify that block "Inner-1" is contained within block "Outer-1" and block "Inner-2" within block "Outer-2". Verify that the block "Inner-1" has borderlines on all four sides. Verify that the block "Inner-2" has no borderlines on any of its four sides.