$d=10;$c;for(1..$d){$c=$c.int(rand(10));}print"$c\n";$g;$w='';$m=280;$t=$m;$|=1;do{$g='';for(1..$d){$g=$g.int(rand(10));}print"$w$g\r";if(substr($g,0,1)eq substr($c,0,1)){if($t>0){$t--;}else{$w=$w.substr($c,0,1);substr($c,0,1)='';$d=$d- 1;$t=$m;}}}until($d==0)

##</code><code>##

$d=shift;for(1..$d){$c.=int(rand(10))}$t=$m=320;$|=1;while($d){$g='';for(1..$d){$g.=int(rand(10))}print"$w$g\r";if(substr($g,0,1)eq substr($c,0,1)){if($t){$t--;}else{$w.=substr($c,0,1,'');$d--;$t=$m;}}}