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That-trace and for-trace effects

Whoi do you think (*that) ti ate the apple? 

That trace violations are blocked by the presence of the following equation:

Sr.b:assign-comp inf_nil/ind_nil/ecm 

on the bottom of the Sr nodes of trees with extracted subjects (W0). The ind_nil feature specification permits the above example while the inf_nil/ecm feature specification allows the following examples to be derived:

Whoi do you want [ ti to win the World Cup]?  (618)0(618
Whoi do you consider [ ti intelligent]? 

The feature equation that ruled out the that-trace filter violations will also serve to rule out the for-trace violations above.

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