Former & Latter
From 'Vocabulary' part of The ABC Of Plain Words by Sir E Gowers (1951)

Use former and latter sparingly, and only when they follow so closely the words to which they refer that the reader does not have to look back to see which is which.

Remember that former and latter can refer to only two things and if you use them of more than two you may puzzle your reader. If you want to refer otherwise than specifically to the last of more than two things, say last or last-mentioned, not latter.

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