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A. Each cell contains a country: they all have different inital letters. B. The arrows indicate alphabetical order for the corresponding row/column. C. For each of the 6 continents there is a column containing 4 of its countries; the only exception is Indonesia appearing in the Oceania column. D. Countries in the same column are connected either directly (ie they share a land border) or via other countries in the same column, with the exception of North America and Oceania columns. E. There are 4 countries that do not border any other country in the quiz.
Column 2 and 3 couldn't be replaced by:
dominican republic - grenada - haiti - jamaica
france - luxembourg - monaco - netherlands ??