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Assuming no leading zeros (example: exclude the number 0400), then the answer is 20. Here they are:

1003, 1012, 1021, 1030, 1102,

1111, 1120, 1201, 1210, 1300,

2002, 2011, 2020, 2101, 2110,

2200, 3001, 3010, 3100, 4000

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