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For the white/green split-colour circle, solvers in North America can probably just ignore the white half, while solvers elsewhere can probably ignore the green half. For the purple/brown one, young solvers can probably just ignore the purple half, while older solvers can probably ignore the brown half. Line 5 might be easier like this:
Not everything you'll extract is a letter.
You need to convert colours into letters, into numbers, into colours to complete the circle. Line 3 might be easier rendered like this:
Extract the message and look up the catalogue number indicated by the purple boxes. Here are all the lines made a bit easier: