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AFAIK there's no limit on the number of icons that can be placed in a 'composed icon', I have one with six. I create integer columns on which to hang composed icons, so I use the 'composed icon with no text' option.
I think of a composed icon as a fixed array, with each slot assigned to condition. e.g. first slot gets a transparent_square if there's no epub else it gets an epub icon; second slot gets transparent_square if there's no pdf else it gets an pdf icon etc.
If you want a transparent square knock the .txt off the end of the attachment.
BR
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