29The Supreme Court considers that, although the judgments in Case C-416/02 Commission v Spain [2005] ECR I-7487; Case C-121/03 Commission v Spain [2005] ECR I-7569; Case C-194/05 Commission v Italy [2007] ECR I-11661; Case C-195/05 Commission v Italy [2007] ECR I-11699; and Case C-263/05 Commission v Italy [2007] ECR I-11745 contain various useful pointers in this regard, uncertainty remains as to whether the slurry at issue in the main proceedings must be classified as waste.
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