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1programmers.stackexchange.com/a/164002/31260gnat– gnat2015-03-02 12:42:57 +00:00Commented Mar 2, 2015 at 12:42
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Instead of mutating a variable holding the state, you construct a list in which each element represents the state at one point in time.Giorgio– Giorgio2015-03-02 12:50:01 +00:00Commented Mar 2, 2015 at 12:50
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