Buggy python submission (verdict: Runtime Error):
class Dice:
    def __init__(self,t,f,r,l,b,u):
        self.a=[[t,f,r,l,b,u]]
        self.direction={'S':(4,0,2,3,5,1),'N':(1,5,2,3,0,4),'E':(3,1,0,5,4,2),'W':(2,1,5,0,4,3),'Y':(0,3,1,4,2,5)}
    def roll(self,d,n):
        self.a[n]=[self.a[n][i] for i in self.direction[d]]
        self.t = self.a[0]
        self.f = self.a[1]
        self.r = self.a[2]
        self.l = self.a[3]
        self.b = self.a[4]
        self.u = self.a[5]
n=int(input())
for i in range(n):
    if i==0:
        t,f,r,l,b,u = map(int, input().split())
        dice = Dice(t, f, r, l, b, u)
    else:
        a = list(map(int, input().split()))
        dice.a.append(a)
s='SSSWEEE'
w='YYYY'
ans='Yes'
for u in range(n-1):
    for t in range(u+1,n):
        for j in s:
            for r in w:
                if dice.a[t]==dice.a[u]:
                    ans='No'
                    break
                dice.roll(r,t)
            else:
                dice.roll(j,t)
                continue
            break
        else:
            continue
        break
    else:
        continue
    break
print(ans)



Fixed submission:
class Dice:
    def __init__(self,t,f,r,l,b,u):
        self.a=[[t,f,r,l,b,u]]
        self.direction={'S':(4,0,2,3,5,1),'N':(1,5,2,3,0,4),'E':(3,1,0,5,4,2),'W':(2,1,5,0,4,3),'U':(5,4,2,3,1,0)}
    def dice_tuple(self):
        self.b=tuple(self.a)
    def roll(self,d,n):
        self.a[n]=[self.a[n][i] for i in self.direction[d]]
    def roll2(self,d,n):
        self.a[n]=[self.b[n][i] for i in self.direction[d]]
    def roll_w(self, n):
        self.a[n] = [self.a[n][i] for i in (0, 3, 1, 4, 2, 5)]
n=int(input())
for i in range(n):
    if i==0:
        t, f, r, l, b, u = map(int, input().split())
        dice = Dice(t, f, r, l, b, u)
    else:
        a = list(map(int, input().split()))
        dice.a.append(a)
dice.dice_tuple()
s='SNEWUU'
try:
    for u in range(n - 1):
        for t in range(u + 1, n):
            for j in s:
                for r in range(4):
                    if dice.a[t] == dice.a[u]:
                        raise Exception
                    dice.roll_w(t)
                dice.roll2(j, t)
    else:
        print('Yes')
except:
    print('No')

Buggy python submission (verdict: Runtime Error):
class Dice:
    def __init__(self,t,f,r,l,b,u):
        self.a=[[t,f,r,l,b,u]]
        self.direction={'S':(4,0,2,3,5,1),'N':(1,5,2,3,0,4),'E':(3,1,0,5,4,2),'W':(2,1,5,0,4,3),'Y':(0,3,1,4,2,5)}
    def roll(self,d,n):
        self.a[n]=[self.a[n][i] for i in self.direction[d]]
        self.t = self.a[0]
        self.f = self.a[1]
        self.r = self.a[2]
        self.l = self.a[3]
        self.b = self.a[4]
        self.u = self.a[5]
n=int(input())
for i in range(n):
    if i==0:
        t,f,r,l,b,u = map(int, input().split())
        dice = Dice(t, f, r, l, b, u)
    else:
        a = list(map(int, input().split()))
        dice.a.append(a)
s='SSSWEEE'
w='YYYY'
ans='Yes'
for u in range(n-1):
    for t in range(u+1,n):
        for j in s:
            for r in w:
                if dice.a[t]==dice.a[u]:
                    ans='No'
                    break
                dice.roll(r,t)
            else:
                dice.roll(j,t)
                continue
            break
        else:
            continue
        break
    else:
        continue
    break
print(ans)



Fixed submission:
class Dice:
    def __init__(self,t,f,r,l,b,u):
        self.a=[[t,f,r,l,b,u]]
        self.direction={'S':(4,0,2,3,5,1),'N':(1,5,2,3,0,4),'E':(3,1,0,5,4,2),'W':(2,1,5,0,4,3),'U':(5,4,2,3,1,0)}
    def dice_tuple(self):
        self.b=tuple(self.a)
    def roll(self,d,n):
        self.a[n]=[self.a[n][i] for i in self.direction[d]]
    def roll2(self,d,n):
        self.a[n]=[self.b[n][i] for i in self.direction[d]]
    def roll_w(self, n):
        self.a[n] = [self.a[n][i] for i in (0, 3, 1, 4, 2, 5)]
n=int(input())
for i in range(n):
    if i==0:
        t, f, r, l, b, u = map(int, input().split())
        dice = Dice(t, f, r, l, b, u)
    else:
        a = list(map(int, input().split()))
        dice.a.append(a)
dice.dice_tuple()
s='SNEWUU'
try:
    for u in range(n - 1):
        for t in range(u + 1, n):
            for j in s:
                for r in range(4):
                    if dice.a[t] == dice.a[u]:
                        raise Exception
                    dice.roll_w(t)
                dice.roll2(j, t)
    else:
        print('Yes')
except:
    print('No')