Question: What denominations are the stamps with themes Opera, Léopold Simoneau and Pierrette Alarie?
SQL: SELECT "Denomination" FROM "1-11900773-4" WHERE "Theme" = 'Opera, Léopold Simoneau and Pierrette Alarie';

Question: What kind of paper were the stamps with the theme Duck Decoys, Barrow's Golden Eye printed on?
SQL: SELECT "Paper Type" FROM "1-11900773-4" WHERE "Theme" = 'Duck Decoys, Barrow''s Golden Eye';