Controlling One Light from Two Switches - Three Way Switch – Kleverness Community
wiring - Power to a light, through two lights and then to a switch - Home Improvement Stack Exchange
3 way switch with power feed via the light (multiple lights) | How to wire a light switch | Electrical wiring, Home electrical wiring, Light switch wiring
3 Way switch with feed at light | Terry Love Plumbing Advice & Remodel DIY & Professional Forum