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\environment back-0
\startuseMPgraphic{mpos:par:columnset:shade}
numeric h ;
for i=1 upto nofmultipars :
h := bbheight(p) ;
if multikind[i] = "single" :
fill multipars[i] topenlarged -.5h
withshademethod "linear"
withshadedirection shadedup
withcolor boxfillcolor shadedinto .8white ;
fill multipars[i] bottomenlarged -.5h
withshademethod "linear"
withshadedirection shadedup
withcolor .8white shadedinto boxfillcolor ;
elseif multikind[i] = "first" :
fill multipars[i]
withshademethod "linear"
withshadedirection shadedup
withcolor boxfillcolor shadedinto .8white ;
elseif multikind[i] = "middle" :
fill multipars[i] topenlarged -.5h
withshademethod "linear"
withshadedirection shadedup
withcolor boxfillcolor shadedinto .8white ;
fill multipars[i] bottomenlarged -.5h
withshademethod "linear"
withshadedirection shadedup
withcolor .8white shadedinto boxfillcolor ;
elseif multikind[i] = "last" :
fill multipars[i]
withshademethod "linear"
withshadedirection shadedup
withcolor .8white shadedinto boxfillcolor ;
fi ;
endfor ;
\stopuseMPgraphic
\definecolumnset
[four]
[n=4,
distance=5mm]
\definetextbackground
[shade]
[location=paragraph,
backgroundcolor=shadecolor,
mp=mpos:par:columnset:shade,
before=\blank,
after=\blank]
\starttext
\startcolumnset[four]
\dorecurse{15} {
\starttextbackground[shade]
\simulatewords[n=10,m=500,min=1,max=5,color=text]%
\stoptextbackground
}
\stopcolumnset
\stoptext
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