```
def countOnes(binary):
i = 0
while i<5 and binary[i]!='0':
i += 1
return i
index = 0
while index<len(data):
binary = bin(data[index])[2:].zfill(8)
numOnes = countOnes(binary)
if numOnes==1 or numOnes>4:
return False
while numOnes>1:
index += 1
if index>=len(data) or countOnes(bin(data[index])[2:].zfill(8))!=1:
return False
numOnes -= 1
index += 1
return True
```