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An example of when to apply a kerning table before a letter is replaced is in the case of the word 'difficult', where the letters 'f f i' are converted to the single character 'ffi' in some fonts. The correct kern for 'i/ffi' is, however, the same as the kern between an 'i/f', and so Arbortext APP should apply this kern first, and then change the 'f f i' into an 'ffi'. The diagram below shows how 'i/f' kern, and how changing the setting of tkfirst alters the text appearance. (The most noticeable difference is that with tkfirst
1 the 'i/c' kern has been disabled.)
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