Loop Control Structures

`BREAK`	Leaves a loop immediately.
`CONTINUE`	Jumps to the next occurence of a loop.
`DO` ... `LOOP`	Infinite loop.
`FOR` ... `NEXT`	Counter loop.
`FOR EACH` ... `NEXT`	Enumeration loop.
`REPEAT` ... `UNTIL`	Loop with an exit test at the end.
`WHILE` ... `WEND`	Loop with an exit test at the beginning.