N=int(input())
L=[]
for i in range(N):
  s,x=input().split()
  x=int(x)
  L.append((s,x))
v=[998244353,10**9+7]
e=107
for mod in v:
  w=0
  c=0
  for i in range(N):
    s,x=L[i][:]
    n=len(s)
    q=pow(e,c,mod)
    c+=n*x
    h=0
    for i in range(n):
      z=int(s[i])
      h+=z*pow(e,i,mod)
      h%=mod
    m=pow(e,n*x,mod)-1
    g=pow(e,n,mod)-1
    m*=pow(g,-1,mod)
    m%=mod
    l=m*h
    l%=mod
    l*=q
    l%=mod
    w+=l
    w%=mod
  w2=0
  c=0
  for i in range(N-1,-1,-1):
    s,x=L[i][:]
    s=s[::-1]
    n=len(s)
    q=pow(e,c,mod)
    c+=n*x
    h=0
    for i in range(n):
      z=int(s[i])
      h+=z*pow(e,i,mod)
      h%=mod
    m=pow(e,n*x,mod)-1
    g=pow(e,n,mod)-1
    m*=pow(g,-1,mod)
    m%=mod
    l=m*h
    l%=mod
    l*=q
    l%=mod
    w2+=l
    w2%=mod
  if w!=w2:
    print('No')
    exit()
print('Yes')