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\setuphead[title][alternative=text,style=bold]
\setuphead[subject][alternative=text,style=bolditalic]
\setuphead[subsubject][alternative=text,style=\ss]
\setuphead[subsubsubject][alternative=text,style=\ss\it]

\startbuffer[waltham]
  \input waltham
\stopbuffer

\starttext
\startlinenumbering

\starttitle[title={Waltham}]
\dorecurse{4}{\getbuffer[waltham]\par}

\startsubject[title={Waltham}]
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\startsubsubject[title={Waltham}]
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\startsubsubsubject[title={Waltham}]
\dorecurse{2}{\getbuffer[waltham]\par}
\stopsubsubsubject

\stopsubsubject
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\stoplinenumbering

\stoptext