Help for this page

Select Code to Download

Select or download this
```
1
1 2
...
3
3 4
4
```

Select or download this

my @list = (1,2,3,4);
my $n = 2**@list -1;
...
13: 1101 1 3 4 
14: 1110 2 3 4 
15: 1111 1 2 3 4