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def is_matched(expression):
dic = {'{':'}','[':']','(':')'}
lst =[]
for i in expression:
if i in dic.keys():
lst.append(dic[i])
elif len(lst)>0 and i==lst[-1]:
lst.pop()
else:
return False
return len(lst) == 0
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Stacks: Balanced Brackets
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Python solution using stack principle: