DeclareAttribute( "RegularSemisimpleSubalgebras", IsLieAlgebra );
DeclareAttribute( "ClosedSubsets", IsRootSystem );
DeclareOperation( "IsSpecialClosedSet", [ IsList ] );
DeclareOperation( "DecompositionOfClosedSet", [ IsList ] );
DeclareOperation( "SubalgebraOfClosedSet", [ IsLieAlgebra, IsList ] );
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