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my @arr1 = (1,2,3,4,5);
my @arr2 = (6,7,8,9,10);
my @arr3 = (11,12,13,14,15);
my @mainarr = (\@arr1, \@arr2, \@arr3);

my @mainarr = ([1,2,3,4,5], [6,7,8,9,10], [11,12,13,14,15]);

grep { $_ == $tofind } map { @$_ } @mainarray;