"groups-and-sets" = "Groups and Sets";
"subgroup"="Subgroup";
"supgroup"="Supergroup";
"supnormgroup"="Normal Supergroup";
"subnormgroup"="Normal Subgroup";
"supset"="Strict superset";
"supseteq"="Superset";
"subset"="Strict subset";
"subseteq"="Subset";
"emptyset"="Empty set 1";
"varnothing"="Empty set 2";