lab_5 gowithflow number_of_cases

result=[]

first=0;second=0

for first in range(len(list_data)):

for second in range(len(list_data)):

result.append(str(list_data[first])+str(list_data[second]))

# ==================================
return result
하니 결과가 잘 나오는데 과제를 제출하면 Failed뜨네요! 뭐가문제죠??