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2. Repeating decimal - Wikipedia

   en.wikipedia.org/wiki/Repeating_decimal

   The repeating sequence of digits is called "repetend" which has a certain length greater than 0, also called "period". [5] In base 10, a fraction has a repeating decimal if and only if in lowest terms, its denominator has any prime factors besides 2 or 5, or in other words, cannot be expressed as 2 m 5 n, where m and n are non-negative integers.

3. Grade retention - Wikipedia

   en.wikipedia.org/wiki/Grade_retention

   Grade retention or grade repetition is the process of a student repeating a grade after failing the previous year. In the United States of America , grade retention can be used in kindergarten through to third grade; however, students in high school are usually only retained in the specific failed subject.

4. Heart failure with preserved ejection fraction - Wikipedia

   en.wikipedia.org/wiki/Heart_failure_with...

   Heart failure with preserved ejection fraction (HFpEF) is a form of heart failure in which the ejection fraction – the percentage of the volume of blood ejected from the left ventricle with each heartbeat divided by the volume of blood when the left ventricle is maximally filled – is normal, defined as greater than 50%; [1] this may be measured by echocardiography or cardiac catheterization.

5. Living Books - Wikipedia

   en.wikipedia.org/wiki/Living_Books

   [234] [5] [237] They also included printable pages of puppets, activity sheets, and images from the stories. [5] Additional content was added in-game; for example Arthur's Teacher Trouble, a story focused around a 3rd grade Spelling Bee, was supplemented by three pages of interactive 3rd grade spelling words. [5]