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sclass Schedule { TreeMultiMap entries; new TreeMap jumps; void add(double seconds, A a) { entries.put(Seconds(seconds), a); } void jumpFromTo(double from, double to) { jumps.put(Seconds(from), Seconds(to)); } void speedUp(double factor) { entries = (TreeMultiMap) mapMultiMapKeys(entries, seconds -> seconds/factor); } }