Six apartments A, B, C, D, E and F are built in a line, but not necessarily in the same order.
All apartment are north-facing apartments.
D is built second to the left of F. Neither D nor F is built at the ends.
C is built at one of the ends.
Neither B nor E is built adjacent to D.
Thus, case 1a, case 2 and case 2a are invalid.
One apartment is built between A and E.
Therefore, the final arrangement is:
Apartments B and C are built at the ends. Apartments D and E are built second from the ends.
Similarly,
Apartments A and F are built third from the ends.
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