| http://www.w3.org/ns/prov#value | - If i is omitted, the subsequence will start at the beginning of S. If j is omitted, the subsequence will end at the last element of S. Python also provides the in operator, which allows one to test for membership: if x is some item and S is a list, x in S returns True if and only if x is contained in the sequence S. The expression x not in S returns not (x in S).
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