Form Validation Any One Of 5 Inputs Required

[eluser]Kebabman[/eluser]
Using the standard CI form validation procedures is it possible to require any one of 5 inputs? For example is it possible to have 5 text areas and for validation to succeed any one of those 5 (or more) can have text in it. The only requirement is that not all of the text areas are empty, if that makes any sense...