Buggy python submission (verdict: Time Limit Exceeded):
import random
class Dice:
    def __init__(self, num_list):
        self.top = num_list[0]
        self.dside = num_list[1]
        self.rside = num_list[2]
        self.lside = num_list[3]
        self.uside = num_list[4]
        self.bottom = num_list[5]
    def north(self):
        (self.top, self.dside, self.bottom, self.uside) = (self.dside, 
            self.bottom, self.uside, self.top)
    def east(self):
        (self.top, self.lside, self.bottom, self.rside) = (self.lside,
            self.bottom, self.rside, self.top)
    def south(self):
        (self.top, self.dside, self.bottom, self.uside) = (self.uside, 
            self.top, self.dside, self.bottom)

n = int(input())
num = [list(map(int, input().split())) for i in range(n)]
dice = [Dice(num[i]) for i in range(n)]
for idx1, i in enumerate(dice):
    for idx2, j in enumerate(dice):
        if idx2 <= idx1:
            continue
        elif len(set(num[0])) < 4:
            while(i.top != j.top or i.rside != j.rside
                  or i.dside != j.dside):
                mode = random.randint(0, 2)
                if mode==0:
                    j.north()
                elif mode==1:
                    j.east()
                else:
                    j.south()
        else:
            while i.top != j.top or i.rside != j.rside:
                mode = random.randint(0, 2)
                if mode==0:
                    j.north()
                elif mode==1:
                    j.east()
                else:
                    j.south()
        if (i.bottom == j.bottom and i.lside == j.lside 
            and i.dside == j.dside):
            print("No")
            break
    else:
        continue
    break
else:
    print("Yes")



Fixed submission:
import random
class Dice:
    def __init__(self, num_list):
        self.top = num_list[0]
        self.dside = num_list[1]
        self.rside = num_list[2]
        self.lside = num_list[3]
        self.uside = num_list[4]
        self.bottom = num_list[5]
        self.dlist = num_list
    def north(self):
        (self.top, self.dside, self.bottom, self.uside) = (self.dside, 
            self.bottom, self.uside, self.top)
    def east(self):
        (self.top, self.lside, self.bottom, self.rside) = (self.lside,
            self.bottom, self.rside, self.top)
    def south(self):
        (self.top, self.dside, self.bottom, self.uside) = (self.uside, 
            self.top, self.dside, self.bottom)

n = int(input())
num = [list(map(int, input().split())) for i in range(n)]
dice = [Dice(num[i]) for i in range(n)]
for idx1, i in enumerate(dice):
    for idx2, j in enumerate(dice):
        if idx2 <= idx1 or len(set(i.dlist)^set(j.dlist)):
            continue
        elif len(set(num[0])) < 4:
            while(i.top != j.top or i.rside != j.rside
                  or i.dside != j.dside):
                mode = random.randint(0, 2)
                if mode == 0:
                    j.north()
                elif mode == 1:
                    j.east()
                else:
                    j.south()
        else:
            while(i.top != j.top or 
                 (i.rside != j.rside and i.uside != j.uside)):
                mode = random.randint(0, 2)
                if mode == 0:
                    j.north()
                elif mode == 1:
                    j.east()
                elif mode == 2:
                    j.south()
        if (i.bottom == j.bottom and i.lside == j.lside 
            and i.dside == j.dside):
            print("No")
            break
    else:
        continue
    break
else:
    print("Yes")

Buggy python submission (verdict: Time Limit Exceeded):
import random
class Dice:
    def __init__(self, num_list):
        self.top = num_list[0]
        self.dside = num_list[1]
        self.rside = num_list[2]
        self.lside = num_list[3]
        self.uside = num_list[4]
        self.bottom = num_list[5]
        self.dlist = num_list
    def north(self):
        (self.top, self.dside, self.bottom, self.uside) = (self.dside, 
            self.bottom, self.uside, self.top)
    def east(self):
        (self.top, self.lside, self.bottom, self.rside) = (self.lside,
            self.bottom, self.rside, self.top)
    def south(self):
        (self.top, self.dside, self.bottom, self.uside) = (self.uside, 
            self.top, self.dside, self.bottom)

n = int(input())
num = [list(map(int, input().split())) for i in range(n)]
dice = [Dice(num[i]) for i in range(n)]
for idx1, i in enumerate(dice):
    for idx2, j in enumerate(dice):
        if idx2 <= idx1:
            continue
        elif len(set(num[0])) < 4:
            while(i.top != j.top or i.rside != j.rside
                  or i.dside != j.dside):
                mode = random.randint(0, 2)
                if mode == 0:
                    j.north()
                elif mode == 1:
                    j.east()
                else:
                    j.south()
        else:
            while(i.top != j.top or 
                 (i.rside != j.rside and i.uside != j.uside)):
                mode = random.randint(0, 2)
                if mode == 0:
                    j.north()
                elif mode == 1:
                    j.east()
                elif mode == 2:
                    j.south()
        if (i.bottom == j.bottom and i.lside == j.lside 
            and i.dside == j.dside):
            print("No")
            break
    else:
        continue
    break
else:
    print("Yes")



Fixed submission:
import random
class Dice:
    def __init__(self, num_list):
        self.top = num_list[0]
        self.dside = num_list[1]
        self.rside = num_list[2]
        self.lside = num_list[3]
        self.uside = num_list[4]
        self.bottom = num_list[5]
        self.dlist = num_list
    def north(self):
        (self.top, self.dside, self.bottom, self.uside) = (self.dside, 
            self.bottom, self.uside, self.top)
    def east(self):
        (self.top, self.lside, self.bottom, self.rside) = (self.lside,
            self.bottom, self.rside, self.top)
    def south(self):
        (self.top, self.dside, self.bottom, self.uside) = (self.uside, 
            self.top, self.dside, self.bottom)

n = int(input())
num = [list(map(int, input().split())) for i in range(n)]
dice = [Dice(num[i]) for i in range(n)]
for idx1, i in enumerate(dice):
    for idx2, j in enumerate(dice):
        if idx2 <= idx1 or len(set(i.dlist)^set(j.dlist)):
            continue
        elif len(set(num[0])) < 4:
            while(i.top != j.top or i.rside != j.rside
                  or i.dside != j.dside):
                mode = random.randint(0, 2)
                if mode == 0:
                    j.north()
                elif mode == 1:
                    j.east()
                else:
                    j.south()
        else:
            while(i.top != j.top or 
                 (i.rside != j.rside and i.uside != j.uside)):
                mode = random.randint(0, 2)
                if mode == 0:
                    j.north()
                elif mode == 1:
                    j.east()
                elif mode == 2:
                    j.south()
        if (i.bottom == j.bottom and i.lside == j.lside 
            and i.dside == j.dside):
            print("No")
            break
    else:
        continue
    break
else:
    print("Yes")