CREATE TABLE table_31517 ("Townland" CLOB, "Area (  acres  ) " FLOAT, "Barony" CLOB, "Civil parish" CLOB, "Poor law union" CLOB)

What is the area when the poor law union is skibbereen and the townland is knockmore?
SELECT "Area( acres )" FROM table_31517 WHERE "Poor law union" = 'Skibbereen' AND "Townland" = 'Knockmore'
SELECT "Area( acres )" FROM "table_31517" WHERE "Poor law union" = 'Skibbereen' AND "Townland" = 'Knockmore'