This is a template!
What happens when we lock two different consequent sub blocks:
This is mixed: mixed1!
This is mixed: mixed3!
Now comes sub2:
This is mixed: mixed2!
This is mixed: mixed4!
As you can see to make mixed rows we really have to enclose
them both in a third sub block. When instance is called
the output is added to where the template is.
There are actually two different ways to lock a sub blocks -
front or back. Lets demonstrate it with a confusing example.
Counting: 9
Counting: 8
Counting: 7
Counting: 6
Counting: 5
Counting: 0
Counting: 1
Counting: 2
Counting: 3
Counting: 4
By default the locking happens at end. In practice you rarely
need locking at front but it is useful sometimes.