DeclareOperation("IsValidString", [ IsAlgebra, IsString]);
DeclareGlobalFunction( "QPAStringQuiverRho" );
DeclareGlobalFunction( "QPAStringSigmaEps" );
DeclareGlobalFunction( "QPAStringDirectLeft" );
DeclareGlobalFunction( "QPAStringDirectRight" );
DeclareGlobalFunction( "QPAStringInverseLeft" );
DeclareGlobalFunction( "QPAStringInverseRight" );
DeclareOperation("LocalARQuiver", [ IsAlgebra, IsString ]);
