from sys import stdin,setrecursionlimit#,set_int_max_str_digits #import pypyjit #pypyjit.set_param('max_unroll_recursion=-1') setrecursionlimit(20000000) # これこどふぉだと無理 #set_int_max_str_digits(200010) mod = 998244353 ii = lambda :int(stdin.readline()) mi = lambda :map(int,stdin.readline().split()) li = lambda :list(mi()) gmi = lambda :map(lambda x: int(x) - 1, stdin.readline().split()) gi = lambda :list(map(lambda x: 0 if x == "." else 1,input())) # グリッド入力受け取り py = lambda :print("Yes") pn = lambda :print("No") pf = lambda :print("First") ps = lambda :print("Second") vec = [(1,0),(-1,0),(0,-1),(0,1)] vec1 = [(1,0),(1,1),(0,1),(-1,1),(-1,0),(-1,-1),(0,-1),(1,-1)] #8方向 inf = 10**18 n = ii() from collections import defaultdict data = [li() for _ in range(n)] cnt = defaultdict(int) g = defaultdict(list) for i in range(n): a,b,c = data[i] cnt[a,b] += 1 cnt[b,c] += 1 cnt[a,c] += 1 g[a,b].append(i) g[b,c].append(i) g[a,c].append(i) for i in cnt: if cnt[i] > 2: print("NO") exit() muki = defaultdict(int) seen = [0]*n for i in range(n): if seen[i]:continue seen[i] = 1 st = [i] while st: v = st.pop() a,b,c = data[v] flag = 0 if (a,b) in muki: flag = muki[a,b] if (b,c) in muki: if flag and flag != muki[b,c]: print("NO") exit() flag = muki[b,c] if (a,c) in muki: if flag and flag != -muki[a,c]: print("NO") exit() flag = -muki[a,c] if flag == 0: flag = 1 muki[a,b] = flag muki[b,c] = flag muki[a,c] = -flag for u in g[a,b]: if seen[u] == 0: st.append(u) seen[u] = 1 for u in g[b,c]: if seen[u] == 0: st.append(u) seen[u] = 1 for u in g[a,c]: if seen[u] == 0: st.append(u) seen[u] = 1 for v in range(n): a,b,c = data[v] if muki[a,b] == muki[b,c] == -muki[a,c]: continue print("NO") print("YES")