MS Excel
Text formulas:

Concatenate and manipulate text
Return ASCII values of characters
Replace cell references
Show formula error value

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MS Excel
If you need to remove only the formatting done in a range (numbers and formula typed there should not be removed), you must

From Edit menu choose Delete
From Edit menu choose Clear and then Formats
Double click the Format Painter and then press Esc key in keyboard
Click on Remove Formatting tool on Standard Toolbar

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MS Excel
A circular reference is

A formula that either directly or indirectly depends on itself
Geometric modeling tool
Always erroneous
A cell that points to a drawing object

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