"A dependent Indian community requires a showing of federal set aside and federal superintendence. These requirements are to be construed broadly and should be informed in the particular case by a consideration of the following factors: 1. the nature of the area; 2. the relationship of the area inhabitants to Indian tribes and the federal government; 3. the established practice of government agencies toward the area; 4. the degree of federal ownership of and control over the are; 5. the degree of cohesiveness of the area inhabitants; and 6. the extent to which the area was set aside for the use, occupancy, and protection of dependent Indian peoples."