There are two ways to put H and G as far apart as we
can. They can go in 2 and 6:
F must then go in 1, and J must go before Q and R.
Or we can put H and G in 1 and 5:
F must go in 6, and J must go before QR.
That means F, G and H can all be in space 1. D is CORRECT.
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