length_list=[]
exam_papers=int(input())
matrix=[[] for _ in range(exam_papers)]
result=[[] for _ in range(exam_papers)]
for i in range(exam_papers):
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from math import inf
import sys
t = int(input())
input_stata = [li for li in sys.stdin]
num_li = [[] for pa in range(t)]
n = [0] * t
for idx, ele in
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