\starttext

    \setupparagraphintro[first][\hbox to 3.5em{\tt FIRST \hss}]
    \setupparagraphintro[first][\hbox to 3.5em{\tt TSRIF \hss}]
    \setupparagraphintro[next] [\hbox to 3.5em{\tt NEXT  \hss}]
    \setupparagraphintro[next] [\hbox to 3.5em{\tt TXEN  \hss}]
    \setupparagraphintro[each] [\hbox to 3.0em{\tt EACH  \hss}]
    \setupparagraphintro[each] [\hbox to 3.0em{\tt HCEA  \hss}]

    some paragraph \par
    some paragraph \par
    some paragraph \par
    some paragraph \par

    \setupparagraphintro[first][\hbox to 3.5em{\tt FIRST \hss}]
    \setupparagraphintro[first][\hbox to 3.5em{\tt TSRIF \hss}]

    some paragraph \par
    some paragraph \par

    \setupparagraphintro[reset]

    some paragraph \par

\stoptext
