Both countries should be prepared to issue different types of visas for the seven categories of people that I listed above. Why not, as we do for the nationals of other countries, have five-year visas with multiple entries, one-year visas for a specified number of entries, single-entry visas for a restricted period, and so on. By and large, we should err on the side of liberalism and issue the longer-term visas rather than the restricted ones.