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The final cross-section may consist of several partial sections. The mutual position of these partial sections follows several rules:
The partial sections may be independent, i.e. they do not intersect nor "touch" each other.
The partial sections may "touch" each other or they even may overlap one another (see Properties of the partial section).
It is possible to combine solid (thin-walled) partial section, thin-walled partial section and library cross-section in one general cross-section.
If solid and thin-walled sections are combined in the general cross-section, principles given in chapter Thin-walled versus solid cross-section should be taken into account.