MOD = 1000000007
h, w = map(int, input().split())
S = [input() for _ in range(h)]

# 10101010... もしくは 01010101... 以外の場合
def solve1():
    T = ['?'] * w
    for i in range(h):
        for j in range(w):
            s = S[i][j]
            if s != '?':
                if T[j] == '?':
                    T[j] = str(int(s) ^ (i % 2))
                elif int(T[j]) != int(s) ^ (i % 2):
                    return 0
    
    res = 2**T.count('?') % MOD
    flag = '?'
    for i in range(0,w,2):
        if T[i] == '?':
            continue
        
        if flag == '?':
            flag = T[i]
        elif flag != T[i]:
            return res
    
    for i in range(1,w,2):
        if T[i] == '?':
            continue
        
        if flag == '?':
            flag = str(int(T[i]) ^ 1)
        elif flag == T[i]:
            return res
    
    if flag == '?':
        res -= 2
    else:
        res -= 1
    
    return res

def solve2():
    res = 1
    for i in range(h):
        flag = '?'
        for j in range(0,w,2):
            if S[i][j] == '?':
                continue
            
            if flag == '?':
                flag = S[i][j]
            elif flag != S[i][j]:
                return 0
        
        for j in range(1,w,2):
            if S[i][j] == '?':
                continue
            
            if flag == '?':
                flag = str(int(S[i][j]) ^ 1)
            elif flag == S[i][j]:
                return 0
        
        if flag == '?':
            res = res * 2 % MOD
    
    return res
    
print((solve1() + solve2()) % MOD)