CREATE TABLE table_18954 ("Club" TEXT, "Played" TEXT, "Won" TEXT, "Drawn" TEXT, "Lost" TEXT, "Points for" TEXT, "Points against" TEXT, "Tries for" TEXT, "Points" TEXT)

Nantyglo RFC had 546 points for and how many points?
SELECT "Points" FROM table_18954 WHERE "Points for" = '546'
SELECT "Points" FROM "table_18954" WHERE "Points for" = '546'