what are all the groups?
socialist group, rpr group, udf group, communist group, radical, citizen and green, non-inscrits
which groups have more than zero caucusing members?
socialist group, rpr group, udf group, communist group
of those groups, which ones have the same number of caucusing members?
rpr group, udf group
which group has the same number of caucusing members as the rpr group?
udf group