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what; which where;where what; where where; which
what; where where; where what; which where; which
the second tower of the World Trade Centre was hit did the second tower of the World Trade Centre fall was the second tower of the World Trade Centre hit the second tower of the World Trade Centre was fallen
what; which where;where what; where where; which
where that the one that which
two; two two; second second; two second; second
whenever however wherever where
had hit did fall was hit was fallen
whenever however wherever where
what ; where where; where what; which where; which
the second tower of the World Trade Centre was hit did the second tower of the World Trade Centre fall was the second tower of the World Trade Centre hit the second tower of the World Trade Centre was fallen