Design space Axes and multiple Masters. Variation in FontLab VI

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FontLab VI for macOS and Windows is a professional font editor, crafted for type designers and font geeks. It lets you create, open, modify, draw, space, kern, hint and export desktop, web, color and variable OpenType fonts for any Unicode writing system, from Latin, Cyrillic and Greek, to Arabic, Hebrew and Indic, all the way to Chinese, Japanese, emoji, symbols and icons.