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import std.stdio;
void main()
{
int[] array = [0, 10, 1, 11, 2, 12, 3, 13, 4, 14, 5, 15, 6, 16, 7, 17, 8, 18, 9, 19];
size_t i=0, j=0;
while (i < array.length)
{
//doSomething(array[i]);
if ((array[i] <= 9))
j++;//don't keep
if (j < i)
array[j] = array[i];
i++;
array.writeln;
}
array.length = j;
array.writeln;
}