\useMPlibrary[dum]

\starttext

\definelabel[test][text=,numberconversion=character,stopper=!]

\resetcounter[test]

\startcombination[2*2]
    {first} {\test}
    {first} {\test}
\stopcombination

\startcombination[2*2]
    {first} {\test}
    {first} {\test}
\stopcombination

\resetcounter[test]

\startcombination[2*2]
    {first} {\test}
    {first} {\test}
\stopcombination

\resetcounter[test]

\startcombination[2*2]
    {first} {\test}
    {first} {\test}
\stopcombination

\stoptext
