Ligatures in the overlay text make some words unsearcheable

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For example you cannot search for the word "dotted" as in a dotted pair.

For example, on page 645, the words "dotted tails" are overlayed with doed tails. Note the unicode ligature.

On page 611: "All of the company’s em- ployees aend this meeting." Note the ligature again. The ft ligature is also commonly wrongly overlayed, as in page 633 "After Louis types this"