Adding an or condition to logic

[#1]

Here is a snippet of code

if((len(trim([First CK249 Date])) >=1 and len(trim([MED249 Date])) >=1),

I want to add (len(trim([First CP249 Date) to the code above as an or statement

Can I just add the logic like this

If (len(trim([First CK249 Date],[First CP249])) >=1 and len(trim([MED249 Date])) >=1),

Or would I need to add a completely new or statement applying the same len function to CP249 Date.

[anbu1984]

If ((len(trim([First CK249 Date])) >=1 or len(trim([First CP249])) >=1)and len(trim([MED249 Date])) >=1)