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begin
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comment
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The string concatenation operator is ||, and the
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default string length is 10 characters unless a
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longer length (up to 255) is explicitly declared;
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string(20) s1, s2;
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s1 := "Hello";
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write (s1 || ", world");
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s2 := s1 || ", world";
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write (s2);
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end
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