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LoopDiagram
LoopDiagram: Contains an additional tag to uniquely identify the
diagram if it contains a loop.
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LoopUVCTDiagram
A special kind of LoopDiagram which does not contain a loop but
only specifies all UV counter-term which factorize the the same
given born and bringing in the same orders.
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LoopModel
A class to store all the model information with advanced feature to
compute loop process.
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DGLoopLeg
A class only used during the loop diagram generation.
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FDStructure
FDStructure: list of vertices (ordered).
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FDStructureList
List of FDStructure objects
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