Suggested answer for Exercise 1

Possible configurations: 2, 3, 5, 6, 9, 12

1: projection: a Y head cannot project WP, XP has no head, etc.

4: projection (Y as head); X' cannot dominate two maximal projections

7: crossing branches

8: complements must be maximal projections

10: lower XP should be rewritten as X; Y' should be a maximal projection

11: X' cannot dominate two maximal projections; the lower XP should be rewritten as 13: adjuncts must be maximal projections

14: specifiers must be maximal projections

15: ternary branching is not allowed