count = 0
a = [1,5,3,4,2]
k = 2
for i in range(len(a) - 1):
for j in range(i + 1, len(a)):
if a[i] - a[j] == k:
count += 1
print("i = " + str(i))
print("j = " + str(j))
print ("count = " + str(count))
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