my %ranges;
for 0..20 {
    %ranges{$_} = '<control>';
}
for 80.. 90 {
    %ranges{$_} = '<control>';
}
my $first;
my $last;
my @r_iter = %ranges.keys.sort(+*);
my $range-no = 0;
my $i = 0;
my %range-nos = 0 => 'first' => Nil;
sub set-range ( Cool $point ) {
    say "see point $point";
    state $range-no = 0;
    # If a first point doesn't exist, this is the first point of a new range
    if !%range-nos {
        %range-nos{$range-no}<first> = $point;
    }
    # if the points are just one off we're part of the same range
    elsif %range-nos{$range-no}<last> + 1 == $point {
        %range-nos{$range-no}<last> = $point;
    }
    # Otherwise it's part of a new range
    else {
        %range-nos{$range-no}<first> = $point
    }
}

for %ranges.keys.sort(+*) {
    set-range $_;
}
say %range-nos.perl;