1. Department of Linguistics, University of Massachusetts, Amherst, Massachusetts 01003,
2. Department of Linguistics, University of Iowa, Iowa City, Iowa 52242,
3. Department of Linguistics, University of Maryland, College Park, Maryland 20742,
4. Reasoning, 32-N, Educational Testing Service, Princeton, New Jersey 08541,
5. Department of Linguistics, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada,