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\environment onandon-speed-000 \ProcessSample{bodyfont} \setupbodyfont[dejavu] \starttext \def\Sample#1% {\start \switchtobodyfont[#1] \setbox\scratchbox\hbox{\tf\bf\it\bi}% \stop} \ProcessSample{bodyfont switch and 4 style changes (first time)} \stoptext