Someone

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

(looping, alternate structure)
O101 do
...
O101 while [condition]

(conditional)
O102 if [condition]
...
O102 else
...
O102 endif

(subroutine definition)
O103 sub
... (using #1 #2 #3)
O103 endsub

(subroutine call)
O103 call [1] [2] [3]