There is no semantic explanation of left and right.
For instance, it would be impossible to describe right and left to an alien in a distant galaxy verbally without a visual cue or common reference point.
Also – on a completely different note – it might be the case that the alien might not be symmetrical and who have no need to know left and right.
Adults have been noted to remember right and left by looking at their thumb which they sucked as a child.
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