Multiple conditions on an action

I'm having trouble with multiple conditions using an OR statement.  Example: How do I set a trigger to accept user input such as a lower case "a" and an upper case "A" without having to create a trigger for both?  The Show Conditions window allows you to add a new condition, but the choice for an OR condition is grayed out.  I'm sure the answer is simple - just don't know what I'm missing.

Thanks!

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