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https://alexostrenko.ru/is_workbook/ ,
Suitable for smartphones, Android tablets, e-readers (except Kindle) and many programs
Can be opened on almost any device
Can be opened on any computer
Opens in Adobe Reader
Optimized and suitable for smartphones
Suitable for Kindle e-readers and Android apps
Suitable for iOS devices (iPhone, iPad, iMac) and most reading apps
Perfect for iPhone and iPad
Development of FB2 format
