Randomising Corsi Block sequence

Complete newby here. The script for the Corsi Block Tapping task always uses the same sequence of numbers, which results in repeating the same virtual path configuration.

How do I go about randomising the sequence that the blocks get presented in?

Here's the code:

/ items =

(8,5,

6,4,

4,7,2,

8,1,5,

3,4,1,7,

6,1,5,8,

5,2,1,8,6,

4,2,7,3,1,

3,9,2,4,8,7,

3,7,8,2,9,4,

5,9,1,7,4,2,8,

5,7,9,2,8,4,6,

5,8,1,9,2,6,4,7,

5,9,3,6,7,2,4,3,

5,3,8,7,1,2,4,6,9,

4,2,6,8,1,7,9,3,5)

/ selectionmode = sequence

/ resetinterval = 0

</list>

Thanks