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{{works with|PARI/GP|2.4.3 and above}} :This code uses the http://pari.math.u-bordeaux.fr/dochtml/html/Programming_in_GP:_other_specific_functions.html#select select function, which was added in PARI version 2.4.2. The order of the arguments changed between versions; to use in 2.4.2 change select(function, vector) to select(vector, function).