How does one use multiple persistent variables?

I need to store t t-1 and t-2 as different variables

Answer 1

[Walter Roberson]

persistent t t_minus_1 t_minus_2

Answer 2

[Jan]

Or

 persistent t
 persistent t_minus_1
 persistent t_minus_2

Walter's and my answer are trivial. Perhaps your forgot to mention a difficult problem.