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It can also be challenging to come up with ten easily distinguishable colours using RGB LEDs. When mixing RGB colours using LEDs, the colour black is not available, and it becomes difficult to tell the colours brown and orange apart. Figure \ref{fig:colours} show the final colour palette we came up with.  Other practical considerations include that if you want the teacher to provide data, give a template with the required format. This helps to not have to unnecessarily transcribe documents e.g. data, for example  converting ``1 min 48 sec'' to ``00:01:48''.