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have been were had been are
have been were is staying has stayed
have been were had been are
had learned have learned learned learning
have learned three thousand learned three thousand of had learned three thousands learned thousands of
double was doubling has doubled is doubled
thousand thousands thousand of thousands of
changed has changed have changed change
had learned have learned learned learning
Thousands of Two thousands Thousand of Two thousand of
that it is to be that it has been to have been
were have been had been are
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