How to select multiple attributes within a dynamic block with LISP "-attedit"

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How do you select multiple attributes within a dynamic block via the LISP "-attedit" command?
Here's the current line in my code: (command "attedit" "" "" "" "" "l" "a" "0" "")
This very effectively makes the attribute text horizontal after the dynamic block containing attribute text is inserted. The problem is, it only works with the last placed attribute because of "l" input when attedit prompts "Select Attributes". Now, I want to add a second attribute to this dynamic block and have it's rotation set to 0 on insert as well.
So is there a way to select all annotations, similar to the "l" input when it prompts to "Select Annotations"? I have tried specifying the two tags I want selected at the "Enter Attribute Tag Specification" prompt, but it clearly doesn't work (as it still prompts for me to "Select Attributes" after). Why would it ask to select attributes when I just told it exactly which attributes to select? I understand this is likely operator error, so an explanation would be appreciated.