“34. The court concluded that, looked at in this way, the national legislation created a difference in treatment between resident and non-resident students. A residence condition, such as that required by this legislation, was more easily satisfied by Belgian nationals, who more often than not reside in Belgium, than by nationals of other member states, whose residence is generally in a member state other than Belgium. It followed that the national legislation affected nationals of member states other than Belgium more than Belgian nationals and placed them at a particular disadvantage which was indirectly discriminatory. The second cumulative condition—as to the right to remain permanently in Belgium-which the Advocate General said was necessarily linked to a characteristic indissociable from nationality and directly discriminatory, was subsumed into the first when the two conditions were treated cumulatively. The fact that the court then went on to consider whether the difference in treatment was objectively justified makes it plain beyond any doubt that it considered the case to be one of indirect, rather than direct, discrimination.”