Cover V05, I09
Article
Figure 1
Figure 2
Listing 1

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Figure 1: Operators

=             to see if values are equal
\>         one value greater than another
\>=        greater than or equal to
\<         less than
\<=        less than or equal to
!=            not equal to
+             to add
-             to subtract
\*            to multiply
/             to divide
%             to see the remainder
:             to match one value with another
- the second variable must be a
regular expression.