The main program code, where your instructions reside, must start with the Begin keyword and
finish with the End. keyword.
Begins and ends are also used within the program to delineate program blocks.
Note the full stop at the end of the End.
This indicates that it is the last End in the
program.
Only this last End. can have this
full stop.
All program instructions between a Begin and an End must be
terminated by a semi-colon (;).