General | Combat Stamina
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Tandem Trip (Combat, Teamwork)

Source Ultimate Combat pg. 122
You know how to work together to trip your foes.

Benefit: Whenever you attempt a trip combat maneuver against an enemy threatened by an ally with this feat, you roll twice and take the better result.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 133
When attempting to trip a target that is threatened by one of your allies, you can spend 2 stamina points to gain this feat’s benefit even if the threatening ally doesn’t have this feat.