PFSRD:Combat Style Master
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Combat Style Master (Combat)
You shift between combat styles, combining them to increased effect.
Prerequisites: Improved Unarmed Strike, two or more style feats, base attack bonus +6 or monk level 5th.
Benefit: You can switch your style as a free action. At the start of combat, pick one of your styles. You start the combat in that style, even in the surprise round.
Normal: It takes a swift action to begin or switch your styles.