Someone

(looping)
O100 while [condition]
...
O100 endwhile

(looping, alternate structure)
O100 do
...
O100 while [condition]

(conditional)
O101 if [condition]
...
O101 else
...
O101 endif

(subroutine definition)
O102 sub
... (using #1 #2 #3)
O102 endsub

(subroutine call)
O102 call [1] [2] [3]