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2.2.9 The Variable It
When CoCoA evaluates an expression, the result is usually assigned to the special CoCoA variable named It.

Example 
  1+1;
2
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  It;
2
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  It+1;
3
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  It;
3
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  X := 17;  -- "It" is not changed if there is no output
  It;
3
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  X+It;
20
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