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Chemists Make Olympic Rings On a Molecular Scale 89

ananyo writes "Chemists in the UK have made a five-ring polyaromatic hydrocarbon and dubbed it 'olympicene'. The molecule is just a couple of nanometers wide and can be regarded as a little fragment of graphene. Strictly speaking, of course, the molecule might constitute an 'unofficial use' of the motif and land the scientists in court for copyright infringement."

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egrep patterns are full regular expressions; it uses a fast deterministic algorithm that sometimes needs exponential space. -- unix manuals