# your code goes here
b = []
a = [0]*100
 
def bin_to_int(x):
	j = len(x) - 1
	sum = 0
	for i in x:
		if i == 1:
			sum += pow(2, j)
			j = j - 1
		else:
			j -= 1
	return sum
 
def permutation(i, x):
	if i >= x:
		b.append(a[0:x])
		return
	if a[i-1] == 1 or a[i-1] == 0:
		a[i] = 0
	permutation(i+1, x)
	if a[i-1] == 0:
		a[i] = 1	
	permutation(i+1, x);
 
a[0] = 1 
permutation(0, 4)
dict = {}
for i in b:
	key = bin_to_int(i)
	if key not in dict.keys():
		dict[key] = key
print dict.values()

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