Xiao Wang is a librarian responsible for shelving 6 books labeled A, B, C, D, E, F on a shelf with positions 1 to 6.

The constraints are:
1. Book D must be to the left of book E.
2. Book E cannot be placed in position 2.
3. Book A must be to the right of book D.
4. Book B must be to the right of book C.
5. Book A must be to the left of book E.
6. Book F cannot be placed in position 1.
7. Book D must be placed in position 1.

Question:
Based on the above conditions, please arrange the 6 books from left to right on the bookshelf, i.e. positions 1 through 6. Return your answer with the format <<< a list of strings >>>, one solution is enough.for example:
<<<["A", "B", "C"]>>>
Your answer:
