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Had we known We had known it If we were known If we know
take took had taken have taken
arrived at; had taken off had got to; took off got to; had taken away arrived at ; had taken away
take had taken took have taken
will effect have effect would have effected had effected
would arrive might arrive had arrived might have arrived
taken place injected worked out worked
will effect have effect would have effected had effected
is not polluted would not be polluted had not been polluted would not have been polluted
take have taken took had taken
has bad effect on had a bad effect on has a bad effect on had bad effect on
taken place injected worked out worked
take had taken took have taken
if we have if have we if we had if had we
take taken to take to be taken
would take did take had taken would have taken
take had taken took have taken
if we have if have we if we had if had we
if we have if have we if we had if had we
take had taken took have taken
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