De-duplicating a range that's not necessarily sorted seems to be a pretty common task, so here's a generic function for whoever else might want to do this:
import std.range.primitives; auto deduplicate(R)(R range) if (isInputRange!R) { import std.algorithm : filter; alias E = ElementType!R; bool[E] seen; return range.filter!((e) { if (e in seen) return false; seen[e] = true; return true; }); } T -- Why have vacation when you can work?? -- EC