How do I connect a timer switch to the other end of a 3 way switch?

I have a 3 way that controls the porch light, and on the other end I'd like to connect a timer switch. I tried several different wiring configurations and nothing seemed to work. It's a little tricky because the timer switch is also in the middle of a series of switches controlling other lights. The lone 3... show more I have a 3 way that controls the porch light, and on the other end I'd like to connect a timer switch. I tried several different wiring configurations and nothing seemed to work. It's a little tricky because the timer switch is also in the middle of a series of switches controlling other lights. The lone 3 way has a red, ground, and 3 black conductors and the timer switch has green, white, black and red. I'm a bit lost.
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