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In the beginning when I heard about 650 gravel thing I considered it in the same way as @miro_o, but later got concinced that wide 650b & narrow 700c knobby is the way to go.
Weird conclusions imho.
Set 1 (trails and cx) = big, treaded tyres in 650b
Set 2 (road) = smaller slick or file-tread tyres in 700c