[Oops.]

[zx9w]

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Page 29 in book or page 9 in chapter 1.

There is a fancy L in the word less:

The variable -fancy L- counts the number of items in the array that are less <- the problem is in this word.

[plin25]

This is probably intentional, to tie the variable to the meaning.

[jeffgerickson]

As Patrick suggests, this is an intentional mnemonic device.