CREATE TABLE table_203_586 (id NUMBER, "#" NUMBER, "nation" CLOB, "qualification tournament" CLOB, "place in qt" NUMBER, "sailor" CLOB)

which nation had their sailors as robert scheidt and bruno prada ?
SELECT "nation" FROM table_203_586 WHERE "sailor" = 'robert scheidt' INTERSECT SELECT "nation" FROM table_203_586 WHERE "sailor" = 'bruno prada'
SELECT "nation" FROM "table_203_586" WHERE "sailor" = 'robert scheidt' INTERSECT SELECT "nation" FROM "table_203_586" WHERE "sailor" = 'bruno prada'