Plug on the left came out of a cylinder that is getting oil in it,
Rings or valve/valve seals.
That plug is also newer looking than the other three making me think someone has been often changing the plug in the bad cylinder as a bandaid solution.
Champion plugs in my experience do not work well in an engine using oil, quit firing much sooner than other brands.
Flood an engine once with Champion plugs and you will be replacing a few, other brands seem to be more forgiving.
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