#        1         2         3         4         5         6         7         8
#2345678901234567890123456789012345678901234567890123456789012345678901234567890
for$a(1..pop){@_{map{sprintf"%.3f",$_[0]*$a/$_}1..$a}++}sort{$a<=>$b}keys%_

grep!$_{$_}++,sort{$a<=>$b}map{$a=$_;map{sprintf"%.3f",$_[0]*$a/$_}1..$_}1..pop

my%y=map{$_=>[1..$_]}1..pop;@_{map{sprintf"%.3f",$_[0]*$a/$_}@$b}++while($a,$b)=each%y;sort{$a<=>$b}keys%_