CREATE TABLE table_204_172 (id DECIMAL, "year" DECIMAL, "representative" TEXT, "hometown" TEXT, "placement in miss nepal" TEXT, "special awards at miss nepal" TEXT, "placement in miss pokhara" TEXT)

who was the only representative who won a special award at miss nepal but did not place at miss nepal ?
SELECT "representative" FROM table_204_172 WHERE NOT "special awards at miss nepal" IS NULL AND "placement in miss nepal" IS NULL
SELECT "representative" FROM "table_204_172" WHERE "placement in miss nepal" IS NULL AND NOT "special awards at miss nepal" IS NULL