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import std;
void main()
{
Array!(Tuple!(string, string)) data = [
Tuple!(string, string)("DEV", "D1"),
Tuple!(string, string)("DEV", "default"),
Tuple!(string, string)("DEV", "D1"),
Tuple!(string, string)("QAS", "Q1"),
Tuple!(string, string)("QAS", "Q1"),
Tuple!(string, string)("QAS", "default"),
Tuple!(string, string)("PRD", "P1"),
Tuple!(string, string)("PRD", "P1"),
Tuple!(string, string)("PRD", "default")
];
auto range = data[]
.array
.sort
.uniq!((tup1, tup2) => tup1[0] == tup2[0]);
range.each!writeln;
}