Additional text characters after pressing alt a

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Question

There are annoying additional characters after pressing alt+a. Picture explain better this mater. How to avoid this additional characters?

Answer

For technical reasons, SuperMemo 15 disallows empty texts. Those dummy texts appear only if you do not fill out question and/or answer fields.

Technical

Empty texts required a great deal of special processing and having texts non-empty simplifies the code. All empty texts are converted to shortest possible unique strings.