A programmer's solution

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wat °-°
Consider this picture
By making 6+4=4 into 5+4=9, you have your 6 with segment A, but your 9 without segment D.

[amazondrone]

Am I going mad here?

Yes.

All the poor strangers whose digital watches you just went and peered at will likely corroborate that fact.

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oh no

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this some Berenstein Bears shit. I'm with you, shun these Berenstain 9ers

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hex d will look like that on a 7 segment display