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@ -469,6 +469,8 @@ A countour is said to be enclosed if it fits completely within another contour.
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Pairs of contours may belong to the same pure intersection chain.
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Pure Intersection chains are a chain of contours that can all
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be linked together by pure intersection relationships ( see figure \ref{fig:pic} ).
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That is to say that all contours within a pure intersection chain are `reachable'
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via pure~intersection relationships.
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Contours in the pure intersection chain may enclose other members
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in the same chain, but not the contour that they are purely intersected with (see figure \ref{fig:picwaie}).
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\par
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