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sub fy_shuf{my($l,$c,$r)=@_;map{$r=int(rand($_+1));
@$l[$_,$r]=@$l[$r,$_]}reverse 0..$#$l for 0..$c||0};

my @a=(1..52);
fy_shuf(\@a,5);

sub fy_shuf{my($l,$r)=@_;map{$r=int(rand(@$l-$_+1));@$l[-$_,$r]=@$l[$r
+,-$_]}0..$#$l};