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Stacked relatives of the kind in ((229)) 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 ((230)) is ungrammatical.
- *[[the book [that Bill likes]] [Mary wrote]]
Again, no good way of handling this constraint is known to us