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The linguistic base contains the description of each linguistic variable and their linguistic terms and the description of the universe on which they are defined.
For example, the linguistic variable ``Altitude''
is defined from 0 to 4000 meters with a step (resolution) of 10 meters
( 
) and can take three linguistic terms: low, middle and high. Each term
is represented by a fuzzy set (figure 3):
Figure 3: Definition of the linguistic variable ``Altitude''.
