24 System Construction ![]() ![]() ![]() 24.1.2.1.1 Examples of Feature ExpressionsFor example, suppose that in implementation A, the features spice and perq are present, but the feature lispm is not present; in implementation B, the feature lispm is present, but the features spice and perq are not present; and in implementation C, none of the features spice, lispm, or perq are present. The next figure shows some sample expressions, and how they would be read2 in these implementations.
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