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use List::Util qw[ reduce ]; my @in = ( 41888, 41889, 41890, 41892, 41895 ); ... print @missing; 41891 41893 41894
my @in = ( 41888, 41889, 41890, 41892, 41895 ); my @missing; ... print @missing; 41891 41893 41894