After by, we tell the font what comes instead.Imagine our code line was sub f f k f_f_k, then it might as well be that f f was to be replaced by the sequence k f_f_k. If we didn’t put the keyword by after the sequence, it wouldn’t be clear what is to be replaced by what. Please note that these are the actual glyph names, so ä would be spelled out as adieresis, ñ as ntilde etc. In this case, we have three glyphs: f, followed by another f, followed by k.
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