Spreadsheet: if cell contents is greater

I have a spreadsheet, where I want to check if the contents of each cell is greater than a certain value. If TRUE, I’d like to return “YES”, so I filter on these cells. I googled a bit and found the following instructions.
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Column to cell in a spreadsheet

I have a list of gene names in a spreadsheet column hat I need to transform to a row. Using the transpose function does not do the job, because gene names should be in a single cell, comma separated. So, I searched a bit and found the TEXTJOIN function.
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Spreadsheet cells’ contents length

I need to compare a list of UniProt identifiers to a database of protein-protein interactions. All IDs in my list are 6 characters in length, while the database I am comparing to has many entries that are longer. I want to clean these up, since nothing from my list will match to them and I also want to speed searches by making the database smaller.
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Average every n number of rows in a spreadsheet

I have a long column of data that I want to make into a chart. The problem is that the column has over 50000 rows and processing it gets problematic. I looked for a way to average every Nth number of rows, in order to speed up things.
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Shorten contents of spreadsheet cells

I have a spreadsheet file with a list of species’ Latin names. I want to automatically create abbreviations for each species, by shortening both the genus and specific epithet to a certain number of characters. Here’s how to do it.
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