H,W = map(int,input().split())
S = [input() for _ in range(H)]
M = int(input())

yoko = set()
tate = set()
for _ in range(M):
    t,n = map(int,input().split())
    if t == 1:
        yoko.add(n - 1)
    else:
        tate.add(n - 1)
gyo = [[0] * W for _ in range(H - 1)]
retu = [[0] * (W - 1) for _ in range(H)]
for i in range(H - 1):
    for j in range(W):
        if S[i][j] == S[i + 1][j]:
            gyo[i][j] = 0
        else:
            gyo[i][j] = 1
for i in range(H):
    for j in range(W - 1):
        if S[i][j] == S[i][j + 1]:
            retu[i][j] = 0
        else:
            retu[i][j] = 1
import sys
for i in range(H - 1):
    zero = False
    one = False
    for j in range(W):
        if gyo[i][j] == 1:
            one = True
        else:
            zero = True
    if zero == one:
        print('No')
        exit()
    if zero:
        if i not in yoko:
            print('No')
            exit()
for j in range(W - 1):
    zero = False
    one = False
    for i in range(H):
        if retu[i][j] == 1:
            one = True
        else:
            zero = True
    if one == zero:
        print('No')
        exit()
    if zero:
        if j not in tate:
            print('No')
            exit()
print('Yes')