A nation can produce two products: tanks and autos. The table below is the nation's production possibilities: 
Refer to the above table. The total opportunity cost of three units of tanks is:
Definitions:
Vanity and Vexation of Spirit
An expression referring to the pursuit of goals that do not result in satisfaction, derived from Ecclesiastes in the Bible, highlighting the futility of human endeavors.
Friedrich von Schelling
A German philosopher known for his contributions to idealism in the late 18th and early 19th centuries.
God's Work of Art
A metaphorical expression suggesting that something or someone is created with extraordinary skill, beauty, or significance, often implying divine inspiration or craftsmanship.
Bildungsroman
A literary genre focusing on the psychological and moral growth of a character from youth to adulthood.
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