CREATE TABLE table_203_185 (id DECIMAL, "season" TEXT, "a\ technical" TEXT, "b\ scientific" TEXT, "c\ fine arts" TEXT, "d\ improvisational" TEXT, "e\ structural" TEXT, "rising stars!\\u00ae" TEXT, "po\ projectoutreach\\u00ae" TEXT, "university level" TEXT)

what technical challenge was featured in 2013-2014 but not 2014-2015 ?
SELECT "a\ntechnical" FROM table_203_185 WHERE "season" = '2013-2014'
SELECT "a\ntechnical" FROM "table_203_185" WHERE "season" = '2013-2014'