l=[5,10,15,20,5,10]
dup_elem=[]
uniq_elem={}
print(l)
for x in l:
if x not in uniq_elem:
uniq_elem[x]=1
else:
if uniq_elem[x]==1:
dup_elem.append(x)
uniq_elem[x]=uniq_elem[x]+1
print("Duplicate elements: ",dup_elem)
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