Dunno where you are, but the casino I used to go to in the UK years ago they supplied players with little cards & pens to make notes while playing roulette. I also printed out my own special cards for trying my own systems, and openly used then at the tables.
I did feel a bit awkward doing it in case they thought I was somehow "cheating", but that was before I realised that no systems can beat roulette, and as long as you're putting chips on the table the casino doesn't care where exactly you put them...
KK
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