Disparity between cylinders like that is unacceptable if the test was carried out properly.
Some immediately-prior history would be good as well as condition of spark plugs and any adjustments carried out.
Could be any number of things preventing the engine from running - rings, bores, valves, valve clearances, timing, firing order, gasket leakage, to name most, I suppose.
I would guess that with two adjacent pots that much lower than the other pair, the fault is somehow connected.
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