The so-called complex structures :

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As soon as at a subdivision level one encounters several elementary structures then it will be a complex structure. Here are the cases that can be encountered:

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1) The simple alternative structure has two subsets present (0-1 times) exclusive of each other, ie the presence of one excludes the presence of the other. This notion of exclusion being noted by the sign

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Here is an example :

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2) The structure n times or n can be equal to zero !

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In such a case it is considered that there is a group of subset present 0 or 1 times, and if the group is present it is subdivided because it contains a subset present n times !

Here is the result :

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3) The complex alternative structure.

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Structure in which we find several simple alternative structures.

Here is an example :

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4) Complex and mixed repetitive structures

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