Half of them were mined in the first four years, from 2009 to 2013
In the following four years, half of the remainder were mined
In the following four years, half of *that* remainder were mined.
... and so it shall continue
Half of them were mined in the first four years, from 2009 to 2013
In the following four years, half of the remainder were mined
In the following four years, half of *that* remainder were mined.
... and so it shall continue
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