Quests of Doom - lair actions

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Does anyone have some (non copywrighted) examples of what lair actions are?  I was reading the wonderful dragon encounter by Ed Greenwood and it notes 'lair actions' - which from some simple research seem to be a 5e thing - which makes figuring it out for pathfinder a bit tricky.  I can always come up with my own system I suppose but I was hoping seeing what the dragon was actually supposed to be doing might help me do a better conversion.