Create an Verilog coding LED trail. The condition are as follows:

1. LED trail start at LED15, and at the next clock cycle, moves on to an adjacent LED towards LED14, then LED13 and so on until LED10.

2. At any clock cycle, only one LED on the trail will be ON.

3. The trail frequency is set as 1.5Hz.

4. Must use a Counter together with case statements for the trail.