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prevent incorrect lamda characters in pdf preview (don't use dingbats)

sfloresm/rstudio,sfloresm/rstudio,maligulzar/Rstudio-instrumented,tbarrongh/rstudio,john-r-mcpherson/rstudio,thklaus/rstudio,githubfun/rstudio,maligulzar/Rstudio-instrumented,pssguy/rstudio,jzhu8803/rstudio,more1/rstudio,JanMarvin/rstudio,JanMarvin/rstudio,maligulzar/Rstudio-instrumented,maligulzar/Rstudio-instrumented,nvoron23/rstudio,jrnold/rstudio,jar1karp/rstudio,piersharding/rstudio,jzhu8803/rstudio,vbelakov/rstudio,brsimioni/rstudio,jrnold/rstudio,maligulzar/Rstudio-instrumented,pssguy/rstudio,suribes/rstudio,thklaus/rstudio,vbelakov/rstudio,pssguy/rstudio,jar1karp/rstudio,jzhu8803/rstudio,jzhu8803/rstudio,jar1karp/rstudio,sfloresm/rstudio,tbarrongh/rstudio,sfloresm/rstudio,githubfun/rstudio,jzhu8803/rstudio,suribes/rstudio,brsimioni/rstudio,jzhu8803/rstudio,sfloresm/rstudio,vbelakov/rstudio,jar1karp/rstudio,edrogers/rstudio,githubfun/rstudio,nvoron23/rstudio,more1/rstudio,piersharding/rstudio,edrogers/rstudio,more1/rstudio,edrogers/rstudio,pssguy/rstudio,edrogers/rstudio,maligulzar/Rstudio-instrumented,pssguy/rstudio,piersharding/rstudio,githubfun/rstudio,tbarrongh/rstudio,JanMarvin/rstudio,edrogers/rstudio,jar1karp/rstudio,sfloresm/rstudio,tbarrongh/rstudio,vbelakov/rstudio,JanMarvin/rstudio,brsimioni/rstudio,suribes/rstudio,nvoron23/rstudio,suribes/rstudio,thklaus/rstudio,jzhu8803/rstudio,suribes/rstudio,jar1karp/rstudio,brsimioni/rstudio,jzhu8803/rstudio,JanMarvin/rstudio,jrnold/rstudio,piersharding/rstudio,suribes/rstudio,john-r-mcpherson/rstudio,jar1karp/rstudio,thklaus/rstudio,tbarrongh/rstudio,john-r-mcpherson/rstudio,vbelakov/rstudio,JanMarvin/rstudio,githubfun/rstudio,suribes/rstudio,jrnold/rstudio,john-r-mcpherson/rstudio,sfloresm/rstudio,brsimioni/rstudio,edrogers/rstudio,sfloresm/rstudio,john-r-mcpherson/rstudio,thklaus/rstudio,piersharding/rstudio,edrogers/rstudio,thklaus/rstudio,pssguy/rstudio,jar1karp/rstudio,john-r-mcpherson/rstudio,pssguy/rstudio,nvoron23/rstudio,tbarrongh/rstudio,tbarrongh/rstudio,thklaus/rstudio,jrnold/rstudio,john-r-mcpherson/rstudio,jrnold/rstudio,vbelakov/rstudio,maligulzar/Rstudio-instrumented,more1/rstudio,maligulzar/Rstudio-instrumented,piersharding/rstudio,maligulzar/Rstudio-instrumented,jrnold/rstudio,JanMarvin/rstudio,piersharding/rstudio,JanMarvin/rstudio,brsimioni/rstudio,jrnold/rstudio,nvoron23/rstudio,more1/rstudio,brsimioni/rstudio,thklaus/rstudio,more1/rstudio,john-r-mcpherson/rstudio,nvoron23/rstudio,suribes/rstudio,jrnold/rstudio,githubfun/rstudio,more1/rstudio,githubfun/rstudio,edrogers/rstudio,vbelakov/rstudio,jar1karp/rstudio,piersharding/rstudio,more1/rstudio,pssguy/rstudio,piersharding/rstudio,githubfun/rstudio,vbelakov/rstudio,JanMarvin/rstudio,nvoron23/rstudio,tbarrongh/rstudio,brsimioni/rstudio