\useMPlibrary[dum]

\starttext

\definecombination[mycombi][alternative=label]

\setuplabel[combination:mycombi][text={Item },numberconversion=character,stopper=!]

\startcombination[mycombi][2*2]
    {\externalfigure[dummy][width=4cm,height=1cm]}
    {\externalfigure[dummy][width=4cm,height=1cm]}
    {\externalfigure[dummy][width=4cm,height=1cm]}
    {\externalfigure[dummy][width=4cm,height=1cm]}
\stopcombination

\blank[2*big]

\startcombination[mycombi][nx=2,ny=1,continue=yes]
    {\externalfigure[dummy][width=4cm,height=1cm]}
    {\externalfigure[dummy][width=4cm,height=1cm]}
\stopcombination

\blank[2*big]

\startcombination[mycombi][alternative=text,nx=2,ny=2]
    {\externalfigure[dummy][width=4cm,height=1cm]} {alpha}
    {\externalfigure[dummy][width=4cm,height=1cm]} {beta}
    {\externalfigure[dummy][width=4cm,height=1cm]} {gamma}
    {\externalfigure[dummy][width=4cm,height=1cm]} {delta}
\stopcombination

\blank[2*big]

\startcombination[mycombi][2*2]
    {\externalfigure[dummy][width=4cm,height=1cm]}
    {\externalfigure[dummy][width=4cm,height=1cm]}
    {\externalfigure[dummy][width=4cm,height=1cm]}
    {\externalfigure[dummy][width=4cm,height=1cm]}
\stopcombination

\stoptext
