Assume the following pattern continues in both directions. What isometries preserve the pattern? 
Definitions:
Income Growth
An increase in the amount of money earned by individuals or households over time.
Country
A distinct territorial body or political entity that is recognized as an independent nation.
Capital Accumulation
The growth of assets or wealth through investment or profits, often reinvested to generate further growth.
Costly
Something described as costly is considered to have a high price or to entail a great expense, often in terms of money, time, or effort.
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