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+In the second step of the category partition technique, the goal is
+
+2
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+to Identify Categories. Where categories are
+
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+characteristics of each input element. So
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+let me illustrate what that means using an example. And to do
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+that I'm going to use again the example of the split program, as
+
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+00:00:14,440 --> 00:00:16,830
+we are already familiar with it and we kind of already played
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+with it. When we were talking about the generic black box approach.
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+So let me bring back the program, and let me remind you
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+that what the program does is to take two inputs, a string and
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+the size, and it breaks down the string into chunks,
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+whose length is size. If we look at the split program
+
+12
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+there are two input elements, str and size so we going to
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+identify categories for these two. So starting from str, what are
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+00:00:37,930 --> 00:00:41,228
+the interesting characteristics of the string? In, in this step
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+you're going to use your domain knowledge, your understanding of what a
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+string is, and for example we might identify the length of
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+the string and the content of the string as the two
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+main characteristics that we want to focus on. If we now
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+move our focus to size, the only characteristic I can really
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+20
+00:00:57,540 --> 00:01:00,340
+think of for an integer is its value. So that's what
+
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+I'm going to mark here. So at the end of the step
+
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+what we have is that we have two categories. So two
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+00:01:05,030 --> 00:01:08,930
+interesting characteristics for the string input str, which are the length
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+and the content. And one category for the integer input size
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+which is its value. And notice that there's not only one solution.
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+So there's not only one possibility.
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+So that the specific characteristics that you
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+will identify are somehow subjective. But the
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+important point is that you identify characteristics
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+that are meaningful and they sort of cover the main aspects of the
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+inputs, which is the case for the
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+categories that we've identified in this example.