Well, they are digital, just like digital clocks. Now regular clocks have hands, and have the symbols all round the clock -- however, the digital ones don't, they just show you the symbol. Similar to that rough analogy, what if the reason the PG gates don't have nine chevrons is, the ancients decided it was needed to show on the gate any more. What if the function was hardly used. But it could still happen -- if you use the ninth chevron, then the gate chevron color changes from blue to red, or some other color -- showing that the ninth chevron is locked.
Maybe?
Maybe?
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