Billing: differentiate between flag FillLowerBins
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@ -327,13 +327,14 @@ namespace Elwig.Helpers {
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}
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}
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public static IEnumerable<IEnumerable<T>> Permutate<T>(IEnumerable<T> input) {
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List<IEnumerable<T>> output = new();
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public static IEnumerable<IEnumerable<T>> Permutate<T>(IEnumerable<T> input, IEnumerable<T>? forced = null) {
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HashSet<IEnumerable<T>> output = new();
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for (int i = 0; i < Math.Pow(2, input.Count()); i++) {
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List<T> t = new();
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for (int j = 0; j < 30; j++) {
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if ((i & (1 << j)) != 0) {
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t.Add(input.ElementAt(j));
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var e = input.ElementAtOrDefault(j);
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if (e != null && ((forced?.Contains(e) ?? false) || (i & (1 << j)) != 0)) {
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t.Add(e);
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}
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}
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output.Add(t);
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