What specific issue was Arthur Fry trying to resolve with his church hymnal that led to the Post-it Note prototype?

Answer

Keeping paper bookmarks from falling out of his church hymnal during service.

Arthur Fry realized the adhesive could solve his personal problem of paper bookmarks constantly slipping out of his church hymnal pages.

What specific issue was Arthur Fry trying to resolve with his church hymnal that led to the Post-it Note prototype?
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