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A book that flips in both directions is impossible without javascript to my knowledge since what determines the direction is the spine attribute page-progression-direction, I have never heard of anything else that can change the direction of the page flip.
If you're talking about an auto flip pdf, I have never tried to do both direction flip before, I don't really want to nor do I see anyone else wanting that.
I also don't understand why you're confused about the progression direction, every book has a main language, if you have both Hebrew and English in a book then obviously one of them is the primary, e.g. dictionary English->Hebrew, main language is English so page progression direction should be ltr.
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