It's too late for me and I may be wrong, but storing the first character and then the deltas (e.g. consecutive character differences) (got the idea from LanX's Re: Data compression by 50% + : is it possible?) achieved ~50% compression using gzip:

# a.pl
 use strict;
#never warnings;

my @inp = ();
#daraset
for (1..100){

        my @ani = ();
        for (my $x=0; $x<90; $x+=10){
                my @c;
                push(@c, int (rand(10)+$x));
                push(@c, int (rand(10)+$x));
                push(@c, int (rand(10)+$x));
                push(@c, int (rand(10)+$x));
                @c = sort{$a<=>$b}@c;
                for (my $i = 1; $i < @c; $i++){
                        push(@ani, chr(33+$c[$i])) if $c[$i] != $c[$i-
+1] && $c[$i] != $c[$i-1]+1 ;
                }
        }
        push @inp, \@ani;
}

foreach my $abc (@inp){
        print $abc->[0];
        for(my $x=1;$x<@$abc;$x++){
                print ord($abc->[$x])-ord($abc->[$x-1]);
        }
        print "\n";
}
[download]

perl a.pl > xyz
ls -al xyz
gzip xyz
ls -al xyz.gz
[download]

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