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Overt Comp constraint on stacked relatives

Stacked relatives of the kind in ((281)) are handled.
[[the book [that Bill likes]] [which Mary wrote]] 

There is a constraint on stacked relatives: all but the relative clause closest to the head-NP must have either an overt Comp or an overt NPw. Thus ((282)) is ungrammatical.

*[[the book [that Bill likes]] [Mary wrote]] 

Again, no good way of handling this constraint is known to us currently.

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