Arrange the digits 8, 1, 4, 2 in ascending order for the smallest number: 1, 2, 4, 8 &rarr; 1248.<br><br>
&bull; For the second smallest, keep the first two digits then swap the last two.<br>
&bull; 1, 2, 8, 4 &rarr; 1284<br>
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Final Answer: 1284