You could buy
You can buy one of the following:
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One cube of tap water one meter in size
One cube of tap water one meter in size for £1.37 (kn12.10) from hardcoded
Shopping list
You can buy all of the following:
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1 A speck of dust made of anti-hydrogen gas
A speck of dust made of anti-hydrogen gas for US$0.05 (kn0.31) -