1. %hash{'string1'}{'string2'}{'string3'}{'string4'}++;
2. %hash{'string3'}{'string4'}++;
3. %hash{'string1'}{'string2'}{'string3'}++;

##</code><code>##

1. $hash{'string1'}{'string2'}{'string3'}{'string4'}{n}++;
2. $hash{'string3'}{'string4'}{n}++;
3. $hash{'string1'}{'string2'}{'string3'}{n}++;