The clues say "outdoors" for bên ngoài, yet it is not accepted....
Reverse order of Chinese 外邊
邊 Mandarin biān, Cantonese bin1
外 Mandarin wài, Cantonese ngoi6
Yes but actually both bên and ngoài are earlier borrowings of those words. The standard reading for 外邊 is ngoại biên. "Inside" is "bên trong" where trong is from 中 (trung).