Clearly, the given arrangement is as under :
In the first step, the first three and the last three letters are written in a reverse order.
Then, the first four and the last three letters are written in a reverse order.
The process is repeated to obtain successive output steps.
Sixth batch : are trap cut he but say lap
Fifth batch : cut trap are he lap say but
Fourth batch : he are trap cut but say lap
Third batch : trap are he cut lap say but
Second batch : cut he are trap but say lap