lol. jolly good.sounds like a plan Stan
with the numbers there was awareness of 'sound', of lips sometimes moving, of tiny movements in vocal chords, of differing speeds of which the numbers moved, and of the mind trying to get involved in where the numbers should stops; ie "don't stop here, too obviuos!" "wait till the mind doesn't know you're going to stop" "maybe not the next one"
with the letters it was similar and i tried to notice the absence of anyone doing it but because it was sequential lettering it didn't seem random enough...so the idea popped into the old noggin to mix it up and see what letter would jump out in random order.
letters would appear randomly, even a few numbers (wtf). Here it could be seen that there was no-one picking the numbers or letters. they just appear seemingly at random without any evidence of thinking about them before hand.

