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// Why write this..
public static <T, V> Map<T, List<V>> defaultdict_list() {
return new MapMaker().makeComputingMap(new Function<T, List<V>>() {
@Override public List<V> apply(T unusedCrap) {
return Lists.newArrayList();
# When you just want this (Python)
# Or this (Ruby) {|h,k| h[k] = []}
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