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To sum-up: A-3 and A-4 are wrong - the sign only tells you the direction of the first curve, the second one can be whatever A-6d and A-6e are not about sharpness, but about the incoming roads being one-way towards the road you're currently on A-18a is not about cattle specifically, but about farm animals or domesticated animals A-18b is not limited to deer, but any wild animals that might suddenly appear on the road, like elk or boars B-32a is literally "border control", but may also have different variations with different text meaning in general "stop here until you're explicitly allowed to go" All that info can be found on wikipedia.
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