# For some reason, this was raising hell after adding
#   use namespace::autoclean;
my $percent_captions = sub {
    my @left  = @_[ 0 .. $#_ - 1 ];
    my @right = @_[ 1 .. $#_ ];
    return "< $_[0]%", pairwise {"$a to $b%"} @left, @right;
};

my @pcts = ( 1, 5, 10, 25, 50, 75, 100 );
my @pct_captions = $percent_captions->(@pcts);


# So, I replaced it with this.
my @pcts = ( 1, 5, 10, 25, 50, 75, 100 );
my @pct_captions = (
    "< $pcts[0]%",
    map "$pcts[$_-1] to $pcts[$_]%", 1..$#pcts
);