They subsequently worked with Spears on her fifth studio album , `` Blackout `` , for which they collaborated with Spears on four songs : the hit single , `` Piece of Me `` , `` Radar `` , `` Freakshow `` and `` Toy Soldier `` ; and again on her 2008 follow-up album `` Circus `` , for which they produced the songs `` Unusual You `` , `` Phonography `` and `` Trouble `` , the latter two appeared only as bonus tracks .
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