DeclareGlobalFunction("HAP_PlanarTreeJoin"); 
DeclareGlobalFunction("HAP_PlanarTreeLeaves");
DeclareGlobalFunction("HAP_PlanarTreeGraft");
DeclareGlobalFunction("HAP_PlanarBinaryTrees");
DeclareGlobalFunction("HAP_PlanarTreeRemoveEdge");
DeclareGlobalFunction("HAP_DisplayPlanarTree");
DeclareGlobalFunction("HAP_PlanarTreeRemovableEdge");
DeclareGlobalFunction("DisplayVectorField");
DeclareGlobalFunction("RegularCWAssociahedron");
DeclareGlobalFunction("HAP_AssociahedronCells");
DeclareGlobalFunction("HAP_AssociahedronBoundaries");
DeclareGlobalFunction("HAP_DisplayVectorField");
DeclareGlobalFunction("HAP_CriticalCellsDirected");
