Quote from the book "Стеклянное море"

Suitable for smartphones, Android tablets, e-readers (except Kindle) and many programs

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Can be opened on almost any device

Can be opened on any computer

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