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this line explain that firstly stack(consider it as a list) is not empty and element in table is equal to the element at last of stack(consider it as a list) is equal. [-1] is to catch the last element in list.
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this line explain that firstly stack(consider it as a list) is not empty and element in table is equal to the element at last of stack(consider it as a list) is equal. [-1] is to catch the last element in list.