% part of test posted on context list

\starttext

\startformula
\startmathcases
    \NC i \NC if something \NR
    \NC j \NC otherwise    \NR
\stopmathcases
\stopformula

\startformula
\startmathcases
    \NC a_i \NC if something \NR
    \NC a_j \NC otherwise    \NR
\stopmathcases
\stopformula

\startformula
\startmathcases
    \NC a^i \NC if something \NR
    \NC a^j \NC otherwise    \NR
\stopmathcases
\stopformula

\stoptext
