ref: c5b0edecc9106d44e971a3f6d0300736f21fbc12
dir: /sys/src/ape/lib/openssl/crypto/lhash/num.pl/
#!/usr/local/bin/perl
#node     10 ->   4
while (<>)
	{
	next unless /^node/;
	chop;
	@a=split;
	$num{$a[3]}++;
	}
@a=sort {$a <=> $b } keys %num;
foreach (0 .. $a[$#a])
	{
	printf "%4d:%4d\n",$_,$num{$_};
	}