final IMonotonicCollection<NF7> set = deltaNF7.get(x);
for (final NF7 entry : set) {
// Add to corresponding context and activate
Context ctx = contextIndex.get(a);
ctx.addFeatureQueueEntry(entry);
affectedContexts.add(ctx);
ctx.startTracking();
if (ctx.activate()) {
todo.add(ctx);
}