CREATE TABLE table_203_306 (id DECIMAL, "no." DECIMAL, "title" TEXT, "directed by" TEXT, "written by" TEXT, "original air date" TEXT)

how many other episodes were written by john zinman other than reunion ?
SELECT COUNT("title") FROM table_203_306 WHERE "written by" = 'john zinman' AND "title" <> '"reunion"'
SELECT COUNT("title") FROM "table_203_306" WHERE "title" <> '"reunion"' AND "written by" = 'john zinman'