1 DO
2? -| repetitor |
3? -| conditional |
4 ;
5? 
5+ 
5 instruction
6 END
7? name
8 ;
9 %repetitor:
10 name=expri
10.1? TO exprt
10.2? BY exprb
10.3? FOR exprf
10 FOREVER
10 exprr

conditional:

1 WHILE exprw
1 UNTIL expru