Ruudukko

l1 = int(input())
li = []
for x in range(l1):
    li2 = []
    y = 0
    count = 0
    while len(li2) != l1:
        count += 1
        for t in range(1,2*l1):
            if t not in li2 and t not in [z[y] for z in li]:
                li2.append(t)
                y += 1
                break
    li.append(li2)
print("\n".join(map(str,[" ".join(map(str,x)) for x in li])))

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED