Rearrange the letters in the following phrase to form a common salutation during an annual Spring event.

P R O O F   I S   A L L

 

 

 

This puzzle is INTERACTIVE in Java-enabled browsers.  

Clicking on any white cell will interchange its content with the content of the green cell.  Use this method repeatedly as you rearrange the letters.  For example, to move the letter F in the fifth cell to the first cell,  click on the fifth cell, then click on the first cell.